Deron Williams had a bad year last year (at least the first half) but up until that point, he was an elite star player. I don't know what happened to him last year, I think there were some injuries but it is certainly conceivable that he is going to bounce back to at or near that elite level. Plus Lopez is why better than anyone we had to put out there with Garnett last year.
I think Brooklyn is stacked. It can be hard to pull a team together in one season plus there is risk of injury especially for KG. I look for them to be really good for 1 or 2 years, and then drop off the cliff (just in time to make our draft picks really good).