It's funny to me that because of the Patriots' success over the years, fans generally assume that everything they do is just going to be great.
The Patriots are successful because they have the best coach/quarterback combination of all time. That is the engine that drives them to great seasons and Super Bowls. Their success in the areas around those two (e.g. the draft, FA acquisitions, trades, etc.) is good, but not flawless or overly remarkable. Belichick does not have the Midas touch.
Just last week, Packer fans (and you can be sure, fans of every other team) were lamenting how the Patriots had signed Corey Coleman and he was going to be soooo good. He's already been cut. Now they've traded for Josh Gordon. He could be amazing or he could be cut next week. But the assumption is that he's definitely going to be Randy Moss 2.0.