Hmm, I actually liked Spiderman 3 better than the others. Apart from when the Sandman goes "Oh, ok then, I won't try to kill you anymore. Bye!"
I think the Hobbit should mirror the same world PJ brought to us, and that means filming in New Zealand, and filming in New Zealand means Weta. PJ's involved, for goodness sake! As if there's any doubt that anyone else is going to do it!
And I don't think Weta are complacent....passionate and under staffed yes! I am happy with a new director though, that side of things could do with a bit of freshening up, as long as it looks like the same world, for example Gandalf, Elrond, Gollum, Saruman and Galadriel (for the bridge movie) have to be the LOTR actors. Hobbiton and Rivendell should look the same. The trolls that get turned into stone should look like the stone trolls and then we could have a Weta statue of the 'live' trolls to display next to our Weta 'Stone' trolls statue!