I'm not against the idea of 400lb hulking orcs with new animations, but I don't think it's necessary. Bethesda does need to flesh them out a little bit more though. It's like ohh look walking cats and lizards and awesome dark elves and romans and ... uhh orcs? too? okay ....
They just feel thrown in. They should be a bit more tribal, they should have unique gruff voices. They're supposed to be the shock troops of the empire. They should act the part. They're supposed to worship Malacath, let's make some sort of awesome quest involving that (ogre mansions don't count).
And please something has to be done with their armor. Morrowind made them samurai which i didn't think fit, and oblivion gave them some sort of brown baggy sack with nipble rings.