I don't think I've ever read a comment on here about Will being too small. His reputation comes from:
1. He rarely scrambles.
2. When he does scramble, he tends to slide too soon and/or fumble.
3. He shies away from stepping up, standing in the pocket, and taking a hit.
4. When he does take a hit in the pocket, he tends to fumble.
5. He would rather run 15 yards backwards to avoid a hit than go 1 yard forward to reduce lost yards.
6. When he does run 15 yards backwards, he tends to fumble.
7. He doesn't fight through contact, he just falls.
8. When he does fight through contact, he tends to fumble.
9. He's slower, less elusive, and less willing to take a hit than almost every quarterback we've had in the past 15 years. Yeah, some of the comparisons are debatable, but overall, he suffers from the comparisons to Mullen and Moorhead era quarterbacks.
Now, all of that being said, I'm not a Will hater. I'm just saying that we spent the better part of a decade with tough, sometimes punishing, mobile QBs and he's just not one.