Criticism is far more useful than praise.
No it isn't. If you don't praise what they (the developers) did right, then how are they supposed to know what to keep? Criticism has a more profound effect on a game's development, but that doesn't make it more useful or mean that profound effect goes towards a more positive game. In the case of Oblivion, and I'm sure it was true for Morrowind before it, the forums are somehow filled with people who literally think everything about it was inferior to some previous game. There must be some contract to prevent praising what one likes and wished to keep, eh? I'm willing to be spears were largely ignored in any praising about Morrowind that may have occured when it was released, for example. If people loved them and showed they loved them on the forums, Bethesda would have kept them. Bethesda responds to criticism, but a lack of praise shouldn't leave anyone surprised when they axe, say, mounts, spears, crossbows, hand-placed loot, buyable houses, improved quest structure (I guess people didn't notice this in Oblivion and looky here, we've got a crapload of randomly-generated side quests for Skyrim... how wonderful...), mundane things such as being able to break out of prison, etc.