If you like a game that challenges you, then you would like EvE.
Nothing is handed to you. You have to earn it. And not by grinding out missions our quests or raiding dungeons, but by being smarter than other players. Don't expect to be able to walk in and kick ass, but that's not because your character isn't strong enough, its because you aren't. Older players often create alts to show this feature off
PvP - There are numerous accounts of Pirates racking up massive amounts of kills on trial accounts. I was searching for a link and I couldn't find one.
Trading - People do a game where they start with 5k isk (almost nothing) and see how fast they can increase it. Current record is 2 bil in a month I believe. I have no idea how that was done. I am nowhere near that good myself.
http://www.eveonline.com/ingameboard.asp?a=topic&threadID=1308687
PvE - Well you can pve from day one so....
Anyways the point is that its a truly player driven world. I could never agree with the whole "I already have a job" concept, but I will warn that the game is not all excitement all the time. Actually it can be (depending on how you play) but a lot of times you are working towards the next big crazy thing.
Here's a decent description
Edit: Also:
1 server
free updates/expansions
21 day free trial (any of the hal corp members can set you up with the extended trial)
5$ client
you can pay for your subscription with in game money.....