Oh, I've ran into so many of these over the years, so I'll just list some of the more recent ones.
Bioshock - Was supposed to be something that revolutionized shooters, and ended up being a watered down steampunk version of System Shock 2. Still better than most grey/brown shooters that come out nowadays.
Mass Effect - Would've worked a lot better as a miniseries than an actual game. Liked the universe, liked the characters, liked the setting, but the gameplay... When you spend hours reading the codex entries and conversing with the characters, but start running through all the action sequences midway thru the game because you just don't want to do them anymore, even though your victory is a foregone conclusion, you know the game's flawed.
Dragon Age: Origins - It's Neverwinter Nights: Special Edition with Biowares homebrew rules. 'Nuff said.
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