Branch was a pretty good WR. A #2 on most teams, and on a team with a great passing attack, you would think #2 at best, maybe a #3 on some teams. His best year on Seattle, he was Hasselback's 2nd option, and they weren't known as a great offense. Besides him, before Welker/Moss, Brady didnt have a lot to work with. I suppose it's an opinion, but I compared the weapons Brady had with the weapons Manning and Brees had, and I feel he had worse weapons to work with, and still performed very well. When he got weapons that everyone agrees were better than the Chris Givens and Troy Browns of the world, his numbers became elite, and actually passed Peyton's.
As far as Colston is concerned, I think you'd be hard pressed to find someone who thinks anyone Brady had before Welker is better than Colston.