I'm not a huge fan of Enterprise, but after finally caving and watching all the episodes in order on Netflix last year (when the series originally aired a decade ago I gave up early in the first season when the Vulcans were portrayed as a bunch of smug jerks) I decided it did get a few things right.
1. No annoying characters. Not every character on Enterprise was a home run, but none of them were a net negative for the show. There was no Wesley Crusher on this show. Also no Jake Sisko, no Nog, no Neelix, and no Harry Kim. And no Lawaxana Troi or Vic Fontaine now that I'm thinking about it either. Sure, Maywether got nothing to do--I'd still love to know why, did the producers just think he wasn't a good actor?--but he wasn't an annoyance.
2. They did have a few legitimately great episodes. I loved "Regeneration" (The Borg), "Carbon Creek" (T'Pol on Earth in the 1950's), the Mirror Universe two-parter, the episode where Earth is destroyed by the Xindi in an alternate timeline, any episode with Shran, and the fourth season in general. Probably a few more great episodes I'm not thinking of right now. Nowhere near TNG's track record of great episodes, or DS9's, or the Original Series for that matter. But I still think it's a better show than Voyager, which didn't have the courage to even explore its own premise.
3. They fixed Berman and Braga's Vulcan mess in the fourth season by making it the Romulans' fault.
4. They tried to limit the technobabble and generally succeeded.
5. And you know what? T'Pol was my favorite part of the show. I thought she was a great Vulcan and I looked forward to her episodes, and her scenes, more than anything else. I thought she had great chemistry with both Archer and Trip, and I thought Jolene Blalock's portrayal of T'pol had a quietness about it, a kind of serenity, that fit a Vulcan very well. Yes, they sexed her up and made her wear a silly skin-tight outfit, but that's Berman and Braga for you. At least they're both done with Trek now.
At the end of the day Enterprise is very watchable. Nothing about it actively grates on my nerves, none of the characters elicit an eye-roll from me, and the idea of the Enterprise as not being one of the most powerful ships in the quadrant makes it an interesting diversion from every other show.