[quote=gcold]
Mirror's edge. When people talk about DICE, Battlefield automatically gets associated.
[/quote]

One of my faves of all time, a lot of people seemed to think that the first person perspective didn't work well for a free running fluid movement game but I always felt like the sense of motion that it gave worked really well and once you got the hang of it it was really fun to play

[quote=GermanCake]
Vampire the Masquerade: Bloodlines. Buggy as all hell, but it had such a cool setting and gameplay. If it wasn't outright a commercial bomb when it came out, I believe it is at least a cult classic among small groups.
[/quote]

I remember two things about this game no matter how long I go between playing it, the horrible dancing in the nightclub and the sudden scarey moment in that haunted hotel thing at the beginning. 

Personally for me it's got to be 'The World Ends With You', an amazing game with a great story that sort of got overlooked, it had a lot of replay value too. It's also the only game that contains the words 'MUST CONTAIN EMO URGES!!'