I think it's easiest to blame the coach, followed by blaming the quarterback. Yes, the entire offense was a trainwreck. There's not one person to blame.
I think they will end up drafting Daniels or Maye, and will sign a couple of free agent o-linemen. I'm optimistic that they can rebuild, but it will take time.
I agree with this. Offensive lines tend to look really bad until the right combination is found, until things click. It only takes one weak link in the OL for the whole thing to break down. The Pats had a lot of injuries in the OL last season, exposing a lot of weak links. A principal goal should be to replenish the OL depth and overall ability. I am sure they will do this with draft picks and FAs.
The tougher question is whether or not Mac Jones, behind at least a decent OL, and with at least decent coaching, and at least decent weapons, can be a decent QB. I don't know, arguments can be crafted either way, but I have my doubts.
I am perfectly fine to pick one of Maye or Daniels at #3 but I would also like to see a vet brought in. That may be easier said than done. What Vet QB is going to want to sign up to be a designated place holder? Probably only the ones with no other options.