Here are some of mine:
Arc the Lad: End of Darkness (PS2). Good lord this game is insulting to the Arc the Lad series. It took a fairly solid strategy RPG and turned it into generic, action crap.
Eternal Eyes (PS). It's not that it's bad, but it's terribly generic. There is nothing original about it and it's boring AF.
Evergrace (PS2). Same deal as Eternal Eyes, but I wasn't expecting much from it since it was a launch title.
Seven Samurai 20XX (PS2). Frequent slowdowns, lame characters, terrible music and not fun.