Actually I'm not all that impressed with Welker as a return man. I don't see him being much of an improvement for the Pats in that area.
But when it's 3rd down and Brady is looking for a reliable receiver who he has confidence in, it will be Welker or Watson. Again, Wes isn't a #1 WR and he might not even be a #2, but he's the best damn #3 WR in the game IMO and he will make his contributions felt when it matters. He was one of the only bright spots for Miami because the OL was horrible and the offense didn't have time to develop, so he was the recipient of alot of dump offs from a pressured QB. Now in NE, he will be playing with a QB that has a great OL and the time to find him.
I expect Wes to have as good a year as he did last year with Brady throwing the ball.