1. Vampire Savior/ Darkstalkers 3: It has what fighting games should have. I like that it doesn't actually use rounds, which contributes to the game feeling fast. The game has systems in place to give the player options on offense and defense. I could play it for years and not get bored.
2. Persona 3: One of the few games that had me addicted from beginning to end. 4 fixed some of my complaints about the system, but 3 is the one that had me hooked.
3. Street Fighter 3: Third Strike Parries changed fighting games. Many fighting games made after 3 had parry analogues, most of them making parries less of a safe option. Sure, getting your supers parried felt bad, but it was a fun game.
4. Final Fantasy Tactics: Fun game. Felt like probabilities were inaccurate, but that didn't stop me from playing the hell out of this game.
5. Harvest Moon: Friends of Mineral Town: There was a period of time where this was all I played. I don't know why I found it fun. I did.
6. Okami: One of the prettiest games I've played, and the Celestial Brush system led to some fun puzzles. Also, the enemies all had some specific brush effect that they were weak against. It was fun figuring out what that was.
7. Team Fortress 2: I'm bad at it, but I keep playing. Also, I liked that you could be bad at aiming but could pick Medic and still be helpful.
8. Subterranean Animism: The wide variety of options and shot types gave it replayability. Even though some of the shot types were terrible while others were too good. The bosses relied more on patterns this time around rather than being all about dodging skills, and it led to some memorable boss batles.
9. Garou: Mark of the Wolves: SNK's answer to Street Fighter 3, the Just Defend system was a decent parry clone. Also, the cancel system felt rewarding to learn and integrate into your game.
10. Arcana Heart Full: It was fun.
11. Immaterial and Missing Power: One of the most different fighting games released, it is hard for new players to learn and get into, but fun and rewarding once you got past the very steep learning curve. It does a great job at emulating a shooting game.
12. Akatsuki Blitzkampf: Very accessible, it was a fun amateur fighting game. Also remarkable was that it was based more off of Street Fighter than Guilty Gear.
13. God Hand: Ridiculous. In a great way. If you like beat 'em ups, play it.
14. Guilty Gear XX: Accent Core: Wide variety of characters, complex fighting system, fun. Done.
15. Final Fantasy X-2: Had a great fighting system and the job system was really well done. I know people criticize it for the story and for being
Guide Dang It, but I was playing it for the combat, not the story, so I never cared.
16. Metal Slug 4: I liked shooting things. Would have been 6 if not for the third stage's boss battle.
17. Mushihime-sama: If you've seen videos containing a SHMUP with the title "Hardest video game boss ever", it was probably Mushihime-sama. I can respect a shooter that shoves so many bullets on screen it slows down the system.
18. Disgaea: Hour of Darkness: It was basically Final Fantasy Tactics turned
up to 11.
19. Tales of Symphonia: Some of the dungeons weren't that great, but the combat system was fast-paced and there were a wide variety of characters to choose from. Also, ability to play combat multi-player.
20. The World Ends With You: RPG that really takes advantage of the DS's systems. Very well done.
21. Jojo's Bizarre Adventure: Fighting game with some ridiculous combo possibilities. Being a fan of the original series probably doesn't hurt the game either.
22. Legend of Zelda: Link's Awakening: The game that got me into video games. Have many fond memories of playing this one.
23. Robotnik's Mean Bean Machine: I enjoy competitive puzzle games. Made the Sonic Mega Collection worth having.
24. Amplitude: A great rhythm game made by a pre-Guitar Hero Harmonix. Had the tracks of the different instruments in the song laid out before you, and clearing an entire bar made the track play for a while so you could focus on other instruments.
25. Melty Blood: Act Cadenza: Not the best fighting game, and something feels off when a character's best move is down jab. However, the ability to cancel most any move into any other move led to some interesting combo possibilities. If I knew people who played it or the sequel, this would probably be higher on the list.