DS9 is my personal favourite and not only the ST I like the most, but also my favorite TV show in general. I just wanted to point that out so I don't have to read all that "you're not a real trekkie if you love Discovery" bullshit, because I could say the same to ENT and VOY fans.
for me, the sheer depth of DS9, the "greyness", the acting and characters, passion, politics, war, economy, religion and even romance, that unique combination of basically everything - was never matched by any other ST. but the thing is, DS9 also had the luxury of being produced in right time and had some continuity on other beloved ST series - TNG. yes, it's a luxury when you can afford to simply borrow characters from previous series that you know audience will respond positively to. it's also great when you don't really have competition, so if you don't like TNG or DS9, but love the setting and you're in late 80's, good luck finding a better alternative in those years. it seems that people are comparing how they feel after watching (and rewatching) 9 seasons of both series (x24 episodes in each season) to how they feel about Discovery's first two seasons or just the first one, for those who already gave up on it. I find it a bit unfair.
I just finished Discovery and I think it's is very good on its own. it's different, it's faster and darker, it's blockbuster show. it's not trying to be another TNG or DS9, that much is obvious just by looking at number of episodes. there's basically no rest, none of those "plotless" episodes whose only point is to get us to know characters better. those episodes about Quark and his bar, about crew spending their vacation on Risa, various personal and romantic episodes from each show... Discovery lacks that so it's obviously much harder to bond with current crew. I mean, Picard got 9 seasons and couple of movies. Kirk was the first captain. not to mention Worf and O'Brien who were in TNG since 1987. all to the end and then just moved to DS9 that lasted until 1999. of course there's not going to be similar "bonding" when there's different captain every season and he gets about 7 or 8 episodes in which he's the main character.
I'd really like Discovery and DS9 to switch places, to expose modern fans only to the first season of DS9 after watching potential 6 or 7 seasons of Discovery and then ask them to compare them. because DS9 also needed time to get going and I'm saying that as a hopeless DS9 fanboy. when I compare the first two seasons of Discovery to first two seasons of any other ST series, I simply can't find any reason to complain. not to mention it eats Voyager for breakfast. I mean, you can enjoy Discovery if you like J.J. Abrams movies, but Voyager you can't enjoy because it offers nothing, it's 9 seasons of emptiness despite having the most potential.
so yeah, I'm looking forward to third season.