While I'm not a fan of a lot of modern WWE announcers and not sure how great a Byron Saxton would be even if he was allowed to freestyle more, you have to think that a large part of the issue is the rules and rigid format that all the announcers are constrained by. WWE have got to where they are in the industry by being on top of every detail and instilling a professionalism into everything, but at the same time, that means the TV product, and especially the announcing is so over produced, lacks any spontaneity and has little room for anyone's individual characteristics or personality to shine through. As some have already highlighted, there are so many tropes to WWE commentary now, with seemingly almost half their time spent shoehorning a wrestlers nickname into a sentence or cramming in the latest buzz words that they've been told to use.
I've been a big fan of Nigel McGuinness since he's been on NXT and then 205 Live, actually because he doesn't come over as too polished and still says things and delivers analysis that are very unique to him and that you wouldn't normally hear on WWE TV. If he ever gets that promotion to say a RAW or a Smackdown then I'm sure it would only be about 6 months before he sounded exactly like a Tom Phillips.
I've said it before, but for all his faults, Mauro at least sounds different to everyone else. You can find him very annoying - I happen to enjoy him - but at least he has a passion that comes through. I also thought his call of Almas/Gargano at Takeover was fantastic, being a crucial part of building the drama of that contest for me.