Other than the second half of last season not making that much sense, my big issue with Discovery is that unlike earlier Trek, individual episodes seldom have any identifiable themes or messages. At the end of the episode I'm just left feeling like a bunch of stuff happened. I'm not really left thinking "this episode wanted me to consider issue X" or "wow, that was a great comedic romp" or something of the sort.
Of course, maybe I'm not being fair, and it's just really, really hard to do this with a fully-serialized modern story structure. I mean, I can't come up with individual episodes that have meaning on Game of Thrones, or The Expanse, or whatever. It's just that variety in terms of storytelling is one of the key things I love about Star Trek - that it can go from straight action-adventure, to talky message episode, to focused character study, to romance of the week. And I feel like this style really can be integrated into serialization - basically by taking what DS9 did up another notch, or looking at what Discovery tried to do in the (far superior) first half of the second season.