My list of bad, overrated games:
- the Halo series (the PLOT and CHARACTERS for god's sake.. my eyes bleed..)
- Animal Crossing (wanna play obsessive-compulsive collection stuff? go Pokemon instead, it's actually good)
- Lost Planet (dumb combat mechanics, stiff controls, ugly)
- Age of Conan (tries to be an MMO and fails through instancing)
- Haze (graphics 4 years out of date, the only fun gameplay mechanic goes away quickly)
Worst game ever? Impossible to choose, so much crap out there. One of the almost invariably horrible movie tie-ins. Jumper, Transformers, one Spider-Man games.. yeah, probably. Tycoon games, just like adventure titles, are 'easymode' for wannabe developers, so there are some really crappy examples.