Same answer that I was gonna say.
Oblivion was definitely my personal biggest letdown in video gaming ever. I got caught up in the pre-release hype, specifically stuff from http://www.elderscrolls.com/oblivion/media/ (gameplay videos 1-6 - which never made it into the game, but they advertised how this was all in game).
Instead we got dumbed down AI (which bethesda themselves specifically said they 'dumbed down' the AI because they did things that made the game 'feel' broken, so they purposefully limited what the npcs could do), Dark elves with the same voices as the wood elves (and in the gameplay videos, we see a dark elf with the morrowind dark elf voice, which again never makes it into the game), a half assed Kvatch quest (again, we see in the videos of the oblivion gates INSIDE the city and guards riding horses into battle also inside the city, more things that again did not make it into game), a de-tree'd great forest (look at the great forest in the gameplay videos, look at the great forest in your copy of unmodded oblivion, self explanatory), No Caius Cosades (which again, i remember the devs SPECIFICALLY saying that we see Caius Cosades in game in Oblivion as a character that came from morrowind, but he was not, though that's definitely not a deal breaker for me at all but why would they say he was in the game in the first place?), A removed faction (the entire Duke Of Colovia questline was taken out of game), and so much more I can go on about if i felt like it.
It also didnt help that about two weeks before Oblivion was supposed to be released in November 22nd 2005, they suddenly delayed the game to March of 2006, so any of us that were excited and read a lot into oblivion the year prior, had to wait even longer. Of course i dont fault bethesda for that, they had to do what they had to do to keep the game as good as possible, but it's things like that make me wish they would just announce the game once it's ALREADY complete like a month before release or something. The marketing did a terrible thing to oblivion, because there was not only broken promises but they HAD to release the game after the first delay because they were going to piss off a lot of fans (which would have been avoidable had they not have announced the game with all these awesome features so long before it was done and said features werent even in the game yet).
Skyrim may or may not have been worse in this regard, but after the failing of Oblivion I vowed never to get caught up in hype of pre release trailers again, so I either ignored Skyrim pre-release features to save myself heartache or I took what I did hear with a very small grain of salt.
I heard so many good things about Kingdoms of Amalur. Friends were telling me it was "like oblivion but better" with Todd Mcfarlane (of spawn) and a whole slough of praises from people on the internet (a lot here in these very forums). So i decided to try it, played like 15 minutes and turned it off once i realized it had terrible hack n slash fable-like combat, unfortunately that was enough to put me off from the game and miss out on these apparently badass things about it. I may try it again sometime in the future when I'm in the mood, but i dont see that coming soon at all.
Seemed way too Fable-esque and cheesy god of war style hack n slash combat that did not appeal to me at all.