Some of my thoughts....
-I do think that ENT did have a 24th century Trek/Berman kind of feel but I'm not surprised by that because it was Berman who was over the show. Plus Berman had a-until then-relatively successful and long run overseeing Trek, with three previous series and several movies-before Enterprise. Also the more updated tone relative to TOS made sense because television had changed since the '60s. And what worked then, or what some fans might be nostalgic for, wouldn't have worked as well I don't think in the 21st century. To me, the issue wasn't that ENT emulated the tone of 24th century Trek, but that it didn't pay enough attention to its contemporary sci-fi and other genre shows, or even the dawning age of drama in the 24th century. ENT felt stodgy and a bit stale beside stuff like Battlestar Galactica, Firefly, 24, and Alias. A lot of the 21st century dramas grabbed you by the throat and kept you wanting to tune in each week. ENT, to me, often started off their shows with a half-hearted hook-if you can call it that- played by bland characters. It was hard for me to invest in the show because I didn't find the characters all that interesting.
-And when ENT did try to appear more contemporary, removing the name "Star Trek" or the pop tune theme, it felt awkward and made the show seem even more stodgy and a bit pathetic in trying to be 'hip'. It perhaps flipped a finger at the long-time fans, and I'm not sure Berman meant to do that, then again, he also considered "TATV" a valentine to fans so who knows. To me, they should've owned the name Star Trek from the beginning. If you act like you're not proud of the product you're producing what message is that going to send to the long-time fans? And its a bit disingenuous to attempt to corral new fans, or perhaps insulting their intelligence that they wouldn't realize, hey I'm watching a Trek show even if the title says Enterprise. Heck, if you were going to remove the Trek brand, how about not name your show Enterprise? Some of the questionable uses or misuses or looseness with continuity also riled long-time fans needlessly.
-I knocked Berman, Braga for the bland characters, though perhaps that's not completely fair. I think on paper at least and later as the series progressed there was opportunities to create an interesting cast of characters, but I don't know if it was studio pressure, the writing, or what, but by the time the episodes went through the grinder a lot of the potentially interesting things about the characters were removed, squelched, minimized. If I recall if I heard correctly that Archer was supposed to be an Indiana Jones kind of guy and there's shades of that in "Broken Bow" but they are excised quickly. You got Trip as an earthy Southerner reminiscent of Dr. McCoy who clashes with T'Pol are meant to evoke McCoy vs. Spock. The thing is I don't think they really broke new ground there (arguably Tuvok and Neelix had a similar kind of dynamic); and even the romantic relationship between Trip and T'Pol wasn't well handled. They attempted to inject more into T'Pol with her past in the V'Shar (correct?) and then her later drug addiction (oh boy), but the drug addiction thing was not the best way to go, I mean she didn't need drugs to experience emotions-she has emotions but are just repressing them. It's like these guys forgot that in Season 3. Reed as a Section 31 member; which is something that they should've thought up and played out throughout the series. Hoshi being a fraidy cat in space but by season 4 turning into a poker playing (if I recall correctly), martial arts badass. Travis having these long space legs but not having enough opportunity to use his knowledge of various species and space. The potential was there, but IMO the writers often bungled it, or perhaps came to a good idea to late. Also the consistency or organic progression of characters come to mind (like the sudden fighting skills for Hoshi that weren't evident in the earlier seasons).
-The Xindi/Season 3 arc was a breath of fresh air. I think Berman and Braga were finally starting to appreciate the appeal of arc storytelling for 21st century viewers. The arc perhaps went on a too long and was filled with superfluous stuff, but still they raised the stakes and made stuff personal. And with the shadow of 9/11 hanging over us, it made ENT feel more relevant than it ever had before. The Xindi were good villains, the drama was at times gripping, and we saw Trip, T'Pol, and Archer either on the precipice or going over the edge.
-Season 4 was the best, and they finally figured out either the importance of tying the series more closely to TOS or how to do it well, because I'm guessing (though my memory is not great) that there were nods to TOS and definitely to 24th century Trek throughout ENT's run but the TOS links became very prominent in the fourth season. It sucks in a way because they pulled the plug just when the show was finding its footing. If they had cancelled ENT in the first two seasons I wouldn't have cared much.
-I can't say I ever liked ENT for the characters. It as always the outside stuff, like the Xindi/planet killer arc or the various stories from the fourth season that kept me watching. Which was different for me because with TOS/TNG/DS9 I liked both the characters and the stories. I cared about the characters in a way I never did for VOY and ENT. And the few times the characters did interest me, like the vengeful Trip in Season 3 or Dark Archer in Season 3 and then regretful Archer in Season 4, it didn't really last too long.