So I recently decided to finally watch all of Discovery (including rewatching the first two seasons, which I had watched as they came out), and just finished rewatching Season 1. I remember not hating Season 1 when I first watched it (despite hating some of its choices, I think I considered it tolerable), but I liked it better on rewatch. Going into it not being surprised by things like the bizarre choices the show makes with the Klingons let me get past some of my bigger problems. Now I still don't agree with the choices made regarding the Klingons, and a lot of the klingon only scenes still fell flat with me, but I was able to be a bit more detached toward that stuff and not let it bother me.
I think what I liked better the most on rewatch were the main characters. They're not perfect, but I got attached to characters like Stamets, Saru, Culber, Tilly and even Burnham more now then I was back when it originally aired. Not that they don't still annoy me on occasion, but I appreciated them more this time (although the Burnham/Tyler romance was still a bit eye rolling). Also Lorca was just great in his role, both as the hard nosed Starfleet Captain and then when his identity was revealed as a mirror universe Terran rebel. I'd say that Tyler/Voq and L'Rell were probably the weakest of the recurring characters to me, but I found them tolerable this time around.
I also remember preferring the mirror universe episodes to the other episodes originally, but this time around I thought that the Mirror Universe stuff felt a bit drawn out and liked the stuff before and after it a bit more.
Overall I enjoyed this first season rewatch. I don't think any of the episodes are anywhere near the best in the franchise, but there was only one episode that I would rate as less then "Good" (Si Vis Pacem, Para Bellum, which I thought was "meh"). Next up is season 2, which I remember liking better then Season 1 back in the day. Honestly its going to be Season 3+ that will be the real test, but with my enjoyment of the characters increasing with this rewatch and my existing knowledge of the Season 3 elements that I find questionable making stuff that no longer a blindside I'm definitely interested to see how this rewatch/first complete watch turns out.