I avoided watching this for 20 (!) years, because the reviews were ambivalent. But it's really fun. It's not awesome, like the Kirk/Spock series, but it's also (thus far) not excessively moralizing like TNG.
This is the only Star Trek (for me) that captures the wonder of the original series. The writing isn't great, but that was never a thing with Star Trek. They're also a bit kinetic, say, with discovering new Warp-Civilizations.
I also really appreciate that the crew is basically white, except for one black guy that's not blackity-black.
Even the chicks are fine. The writing for the Asian chick is a bit insipid, but it accurately reflects the chick version of the 'hero's journey'.
Unfortunately, they've introduced Time Travel, so I guess a few of the episodes are going to be tedious.
I've watched everything Star Trek and Enterprise was also the last thing I watched. I just finished it for the first time literally a month ago. When I was younger I avoided it because I thought the starting theme music was too gay.
Enterprise got a lot of decent reviews but riding off the coattails of DS9 and TNG with a complete 180 in theme was already going to be difficult. DS9/TNG has just nailed a winning formula and the next Star Trek abandoned it basically so a lot of Trek fans were upset. People at the time wanted something along the lines of TNG/DS9 but a little different, not something as different as Enterprise.
Overall, I enjoyed Enterprise. It's worth a watch. I didn't think Enterprise did anything exceptionally well and nothing was too memorable about it but it was still enjoyable. If you're enjoying it only 18 Episodes in then you'll definitely start to enjoy it more. The last 2 seasons were probably the best and I thought the first half of season 1 overutilized some themes as they were still trying to find a groove.
I listened to the first five notes of the theme song... and have never listened to it again.