Top tier HD games like Uncharted 2 took about two years to develop and release.
Of course Naughty Dog was actually successful in magically pulling that game out on time and above most expectations. I still can't see how they managed to do this and never will without actually taking a close look at the production pipeline for that game.
I don't think anyone, no matter how platform biased, is going to compare something like U2 with the follow up to The Conduit though.
Nintendo titles on the other hand typically have longer development pipelines, which is largely repsonsible for the quality of most of their best efforts. Talented staff and art departments obviously help too.
Barring games that have minimal art resources (Wii Play, Wii Sports Resort, Wii Fit, Wii Fit Plus, pretty much Wii Everything), which typically represent over 60% of the work load for most modern games, Nintendo games on the Wii take as much time as their most visually impressive HD counterparts.