I've played E.T for the sole reason that it WAS bad, so I won't really count that.
But yeah it was fucking bad.
Worst game I've ever played though...hmm...
The only one that really comes to mind right now is Oblivion. Just couldn't play it. Hated the combat, hated the controls, and the story just didn't grab my attention quickly enough to deal with it. I can appreciate why people love it so much...but I just couldn't stick with it. Seriously, first person sword combat just...doesn't...work.
AH I tell you what, Halo Wars was pretty ngh in my opinion, too. It was alright for a little while but it lacked any real depth. It's cool though, I got it on offer for 70p and traded it in for £3. Say whaaa xD.
But yeah, to say these games were bad wouldn't be fair. But they are the games I remember disliking the most. There are probably others but those two come to mind(Y).
edit: Ugh I tried so hard to like Oblivion

. But also, yeah Far Cry 2 was...not great either. Again, tried hard to stick by it but...agh.
ALSO, YEAHYEAH CRYSIS 2. The stealth seemed pointless and it was horrifically repetitive, I thought. Just found myself getting bored. *thinks some more*.