By dark tone, do you mean the crew's harsh treatment of Michael, or the heavy shadows and cinematic lighting?
Re: lighting, I felt the same way about some of the pre-Michael Bay Star Trek movies. Remember in First Contact when Picard is sitting alone in the dark playing Candy Crush on his Kindle, shortly before going all Captain Ahab on his model ship? And in Generations, Ten Forward was a dimly lit storm cellar. In Undiscovered Country, Sulu is captain of a warehouse. Actually, none of the movies as far as I remember are as evenly illuminated as the sets on their corresponding television series. The lighting is a big part of what makes ST
feel wrong I think. If it were illuminated as brightly and evenly as the Enterprise on ST:TNG it would feel more like Star Trek. As it is, it's easy to associate ST
more closely with Battlestar Galactica from the feel of the sets.
Re: Michael's scarlet letter M, yeah, I'm a little over that as well.
She's saved the crew's bacon many times, but all she is to everyone who isn't Tilly or Lorca is a mutineer. If she were a Xindi and murdered 7 million people including Trip's sister, even Trip would've forgiven her by now. The writing regarding the crew's regard for Michael seems flat, lacking any sort of progression. And it makes no sense that she wouldn't explain her actions at her court martial. That part feels contrived and lazy. When has a Vulcan or half-Vulcan or anyone raised on Vulcan ever passed up the opportunity to demonstrate superior knowledge? That's never happened.
By the way, I'm almost finished with Season 3 of Enterprise. Thanks for the suggestion. Damn good series so far.