I wouldn't expect the OS to load that slowly, that could get annoying fast.
Though to be fair no matter what the Wii U ends up being and how bad 3rd party support is, I'll still get one to play the next 3D mario and next Zelda game.
Hmmm...where was this from? the ZombiU review?
To be fair there is a day one patch/update, the whole OS isn't even working properly yet UNTIL the update is installed.
Listened to the Nintendo Video Chat on IGN and they had no such concerns with any aspects of the system in terms of Lag etc, the Day One update is out today for the yanks so we shall see.

these scaling reviews all over the place are confusing...none seem to really be in line.