You really dont think that Gronk or Hernandez are as good as their fantasy value show? Hernandez is a matchup nightmare for any team and Gronk is on pace to become one of the best TE's of all time with regards to catching the ball. He is also instrumental in setting up the run get for BJGE
Yeah I don't think they're as amazing as many here rate them for three reasons.
1. They play with Tom Brady, which pumps up their stats
2. They play in NE's pass happy offense, again pumping up stats
3. NE only has 1 WR that's a big time threat (Welker). This has lead to using them as defacto WRs fairly often. When graded as WRs their stats become less "HoF pace" and more just good.
So do we have to tone down our enthusiasm about every player that has ever played with another good player? Jerry Rice must have been pretty overrated playing out in SF right?
You need to consider the situation a player is in, his role in his offense, and his supporting cast when you evaluate them. For example if you look at AP/MJD/Forte/etc numbers you have to factor in how good his offensive line is. This is the same for a running back, a passer, or a WR/TE.
If you don't consider how many touches, targets, or the system they play you miss an awful lot of what is really going on.
Aaron Herandez has looked like a Greg Olsen clone to me. (does he fumble a lot at really bad times?) A decent offensive player, but nothing to get excited about. Gronkowski is a different sort but while he's very good I don't think he alone is enough of a weapon constitute restocking the offense aroudn Brady.