I have often wondered about that, and it is a good question.
There are a number of things regarding the old regime that have bothered me over the years. The biggest was that after the thrill of a New Trek wore off with TNG, things got boring, and continued to be largely boring.
I think what topped it off was reading interviews with B&B where they made remarks that I think many fans found disturbing such as not having any idea why Nemesis failed, or why Enterprise was failing, or changing the theme on Enterprise to a more country beat in a ditch effort to improve the show.
And then blaming it on "too many trips to the well" It's an easy excuse when you can't really come up with a logical answer.
We saw evidence that this simple answer itself was a lame attempt at covering their backsides.
Coto made a drastic improvement with Enterprise, but by then it was too little, too late to save. And of course the series finale got taken over by B&B and turned into a very large joke. When the new film was first announced, it was cried that it was too soon. Many procalimed quite authoriatively that it would fail.
And here we are, the biggest success in Star Trek History, as I type this barely under the 250 million mark. I guess B&B's remarks were accurate about too many trips to the well, it was jurt taken out of context. It wasn't TREK that had taken too many trips to the well it seems.
Of course this was pretty much confirmed when Braga was overheard on set stating that he could spew out any crap he wanted and Trek fans would just gobble it up anyway. When you have someone that disinterested in what he's doing, you can't really expect much in the way of quality.