I don't think it's accurate to consider Oblivion a "bad" game. Everyone is entitled to their own opinion, of course. But when we scale back from individual tastes and look at the gaming scene as a whole it's pretty obvious that it is considered a very good game.
It routinely places in top X lists for both RPGs and games in general, was an enormous hit when it came out both critically and financially, and it boasts an enormous player base for a game that is just about 7 years old.
There are certainly a lot of people who have problems with it, and many who can't stand it. But seeing as how the general consensus is that it's a good game, I don't think it works in a thread that's discussing games that are generally regarded as bad.
With that out of the way, I can't really think of any games that I like which are generally considered bad.