Give it a go. The new Uber bosses are quite fun, and gives a reason behind farming (getting the keys needed to craft the Infernal Machine to get to them).
The Monster Power thing is pretty cool as well, 10 being pretty damn hard (can't do ubers at 10 yet, 7 max so far).
I still have a lot to do in that game. I stopped I think around Act 2 on Hell.