Oh geez... there's so many games... but to choose the cream of the crop? I'm choosing the best games based on one thing... how it entertained me and was able to draw me back to PLAYING them again. Example : Super Mario is an awesome game and did wonder to the game industry and is probably the best game EVER but under my bar, it's GOOD but not MY favorite game.
Here's a TOP 20 (originally a 10 but comon, doesn't do it justice)
20. Assassin's Creed 2 - They took what needed to be improved in the first game and made everything better. Except the difficulty. Far too easy. What I loved most was the MAGNIFICENT WORK on Florence and Venice... which I visited last year. It felt surreal to revisit the same places and climb them while looking at it as a game. I closed my map and navigated the streets and honestly, 3 blocks down, turn left, 2 blocks, turn right and bam, I walked these streets in RL! WOW.
19. Uncharted Waters 2 - Naval trading RPG on the SNES by Koei. Sounds like a weird RPG but seriously, it had DAYS of gameplay, 6 different characters and a storyline that was really cool.
18. Odium - RPG/ Tactical Horror. You probably never heard of this... too bad for you. Storyline is great. Music is probably top 5 of all time in games.
17. Xenogears - Need to replay this great RPG... only not on the slow as molasses PS2. This game had possibly one of the best storylines ever... the mechanics of the game? Brilliant.
16. Jagged Alliance 2 - I wish this game was modded like crazy with new scenarios but alas nothing. Great gameplay. Company sucks though, they have been unable to make a good sequel since it came out in the 90ies.
15. Romance of the 3 Kingdoms (series) - My favorite is by far the 3rd though other versions like 2, 7,8 and 11 hold great gameplay though always halfassed efforts from Koei. I love the books, I love the movies, the TV shows, heck, I even have a Zhang Fei figurine on my desk.
14. Lufia (1 and 2) - Great RPGs on the SNES. The music fucken ROCKS!!! Combat is solid, storyline is pretty decent.
13. Bioshock - A distant cousin to System Shock 2. It's a solid game though FARRRRR TOOOOOO EASY. Good story but please.... the sequel wasn't anywhere as good. Oh... and EVENNNNNN EASIERRRRR. But it was gorgeous. Did I mention it was easy as fuck?
12. Dead Space - Firstly, System Shock 2 did it better. Though this game is brilliant. And I can safely say that I have in actuality shat my pants while playing it. I actually ran from battle few times like a French soldier. Oh... I made up for it and finished it on Insane.
11. Elder Scrolls 3 & 4 - Fantastic series. Honestly, you can play this for months without seeing it all. I think I finished Oblivion and visited every single place in the game and the expect and probably played over 200+ hours.
10. Left 4 Dead - Great experiences in COOP. Though, 2nd one is better mechanically I still love the first better.
9. Military Madness - Most of you won't know this game. It's a turn based strategy on the TG16. Fantastic game. Remake has been done recently... DOES NOT DO IT JUSTICE.
8. Final Fantasy 6 - Yeah, I said this many times. Best of the FF series.
7. NHL 94 - Why 94? Because it was the first game you could play 4 players in this game. Do you have ANY idea how often I took Gretzky's head off? The series has had its ups and down but still has been a yearly choice for me. Still play regularly with my buddies on my old systems along with the new NHLs as well as NHL Hits 2005 if one of us cannot make it.
6. KOTOR (1 and 2) - So... many choices... if you wanted to be a fucken asshole, this game did it for you with style. Bioware games are fucken awesome. Can't wait for their MMO, doesn't look like it'll suck a dick. Oh and quotes like this give the game great replay value:
Canderous: "
Remember, we're talking about the Force here. At this point, Malak himself could drop out of the sky, and I wouldn't bat an eyelash."
HK-47: I'm 98% percent sure this miniature organic meatbag wants you to help find his fellow miniature organic meatbags.
Revan: And the other 2 percent?
HK-47: T
he other 2 percent is that he is just looking for trouble and needs to be blasted, but that might be wishful thinking from my part.
I hope whoever wrote this material is driving an expensive sports car right now, he/she earned it.
5. Mass Effect (1 and 2) - The 2nd being the better game. Let's be honest, it's a damn shame to have this game in 5th place, in fact, even an insult to some but my top 4 cannot be moved. I love this game... it came out when? January? I've finished this game 5 times already. I've done it all... even Jack. When the fuck is the 3rd one coming out???
4. Pirates - The original. Sure, the remakes are great and I still play that one that came out in 2004 or so. I don't know.... something about this game is awesome. Every replay is totally different in a vast open non-linear game mode that puts you out there and build your dynasty.
3. Chrono Trigger - I was barely a teen when this game came out. I turned down the offer of getting my first handjob ever from a hot portuguese girl in favor of this game. I will not deny my geekness but trust me, I made up for it later and got far more than a simple handjob. Thus you heard from me first, Chrono Trigger.... better than a handjob. The numerous combos and the storyline of this game was amazing. From what I read, it was a production of a Japanese video game dev all-star team. Goddamn this game was sweet.
2. Baldur's Gate 2 - I spoke to some of my D&D buddies the other night and came THIS close to losing a lot of respect for someone who's most likely reading this.

This game is the epitome of awesomeness. There's no reason a person who's a fan of RPGs has not played this game and all its expansions. BG1 gets honorable mentions as well. I probably played this game 10+ times completely.
1. System Shock 2 - There's no denying it. This game is vastly unknown to the masses of the mundane but every single time I took the time to burn the game for someone and shown it to them...
it changed them. Sure, games like Dead Space are great but give those bells and whistles to SS2 and you'll have the best Sci-Fi RPG/FPS Horror gendre you'll ever play. The concept of being stuck in a ship and the point of it is to BE VERY CONSERVATIVE with your VERY LIMITED ammo is great. No other game has gotten back to this... Bioshock was neat but a distant cousin to this great game. Oh, I love playing this game coop and on impossible mode. I've been looking for a partner in crime and of you guys interested?