I think network meddling can be a cover your ass move, but it can also be true. I don't think any of us know enough to say which is the case with Braga. My main passion is comic books and I can say with a high degree of confidence that corporate meddling is crippling a lot of the creative types at DC Comics right now.
Given that Braga had a decent track record at TNG (Cause & Effect, Parallels, AGT), I'm willing to consider the possibility that meddling from execs at least played a role in lower quality stuff that he wrote. Does he still have some responsibility? Of course. But the Trek model looks frigging insane by today's standards (22-24 hour longs, every year, for 7 years) and a guy that has a decent number of good scripts to his name shouldn't have his butthole torn open constantly.