Nope, just the holier-than-thou types who go on about how removing archaic mechanics and trying to make the franchise as accessable to as large a money-paying audiance as possible cheapens and dumbs it down, who proclaim that the previous entry in the franchise is a "damn near perfect RPG experience" with "NO need to add to that", and who believe that "mods ruin games".
Too bad the series went from pure PnP dungeon crawler (Arena/Daggerfall) to adventure RPG (Morrowind) to action RPG (Oblivion), and now you have people from of these denominations and some in between arguing about what the definitive Elder Scrolls game would be. Of course, Daggerfall was a step up from Arena and people still bought it. Morrowind was a step up from Daggerfall (at least in attention to detail and faction/NPC relations, ruthless dungeons and diseases not so much) and people still bought it. Oblivion had some pretty amusing AI and the skill system we've come to know and love, but beneath its surface I felt like I was playing Arena again,
without being able to play the "it's from 1994 so all its shortcomings are novelty" card. As a game on its own, it's fine, as a successor to Daggerfall/Morrowind, people loathe it.
Still, I'm going to agree Capital88 and hope that since Oblivion/FO3 multiplied Bethesda's fanbase they'll now be able to return some substance and still sell plenty of copies. I mean, I believe Morrowind has sold just as many copies as Oblivion (even if it has been on the market longer) and I
still seem to find new copies on retail store shelves from time to time. We can't assume Oblivion players detest earlier mechanics in any way, if anything, we should assume that many of them would enjoy the recycled features. Especially since shiny "new" features is what appears to make or break a sequel in this market nowadays.