Ben started having some devastating blocks near the end of the season, but he also whiffed on key blocks right up to the end in Denver. He is learning, but I would not call him a good blocker yet, great potential and the TE coach (Mangurian) is a good man to bring it out, but not there at yet.
If I had to critique him from a technique standpoint (with the caveat that I'm as amateur an analyst as they come) I'd say he hasn't gotten his field vision in tune, his angles are off a degree or he sees his targets too late. He also tries to pancake them instead of locking on and steering them with leverage. What is encouraging is his improvement over the course of the season, he got better at knowing his assignment (or the coaches adjusted the way they used him to get the most out of his play). He had a wonderful wham block in the Jacksonville game, where he came from being split wide, and decked the DE with as nasty a (clean) blind-side hit as you could ever want. That guy saw some stars.