Deus Ex: Invisible war gets my vote for worst ever. You must not have played many games then? DX:IW was a decent game, hampered by its console roots. Still, the original DX beats it all the way, but sometimes IW's simplicity over the original is welcome change of pace.
i was talking from a performance perspective, it was also shallow, and all Four (?) of the endings left a fair amount to be desired.
the RPG system used from the last DX was gutted, to be honest, IW was a dissappointment
Worst Console game i've played is Bruce Lee: quest of the Dragon, (not nearly as cool as it sounds)
Perfect Dark zero, as pretty as it looks, amounts to pretty much a glorified tech demo, nothing like its N64 predacessor.
as for not playing many games, well.. whaddya want to hear?.. that the last game i've played was "ken's labyrinth" or something? or that i've just finished Dark Star One, and that it's story is rather nice, it doesn't compared to the thumpin' action found in Freespace.
Or that i'm contemplating playing the Entire KOTOR series again, with a bit of Far Cry, or perhaps a spot of Chris Sawyer's locomotion, that is if i can FIND it under the piles of games i've got lurking around here, full towers, and ****e like that.