It has nothing to do with control scheme but more to do with an absolutely shitty UI that's a direct port of the console version, as in Oblivion's case. Or even worse, core gameplay mechanics tweaked, changed, or done away with completely in order to sell to some preconcieved notion of what console gamers want. For example, the EZ-mode compass in Oblivion, or how bastardized Deus Ex 2 ended up.
I'm not saying that console centric gamers can't handle the depth of a PC game, if anything I think consoles and console gamers are finally ready for it, but for some reason game designers DO think that console gamers want EZ-mode gameplay, UI, and all the other things that seem to ruin great PC franchises when they are launched on consoles as well.