No, it was a great game regardless what people say.
you see, while i definitely agree that Oblivion is a great game, there is one main problem in your post, fact is that statement is incorrect, subjects like these are completely subjective, no matter how much ya wont want to admit it, it all depend son prefrence, and a game being good/bad is not fact in any situation, even in the case of Big Rigs, some found the game so bad that they enjoy it.
anyway, i think oblivion is a great game, i still play it, but in my opinion, when ya look at skyrim, and then look back at oblivion, ya cant help but notice how many things Bethesda fixed for skyrim that they did wrong in oblivion, i think that's the issue,