I think the biggest thing that grinds my gears with Discovery in general is their inability to stick the landing. Season 1 was good right up until they got back from the mirror universe. After that it made no sense and the S1 finale was really really awful. Season 2 was pretty good throughout (Pike and Spock were great and If Memory Serves was the best episode of the series). It got a little convoluted with the showrunners getting fired and the pivot from the signals to control, but not terrible. The S2 finale was the least bad of the three. My biggest complaint was the ship battle nearly gave me a seizure with all the spinning ships and flashing lights and I couldn't really see anything. Season 3 was also good up through the mirror universe two parter. After that it crashed and burned (except for the part about Osyrra trying to negotiate for which was interesting). The cause of the burn was underwhelming, the action wasn't really interesting to watch, was pointless, and made no sense and then everything gets resolved in the last minute of the show (Emerald Chain falls apart, etc.). Because the show can't stick the landing, it just leaves a bad taste in your mouth and the worst part of the season is the most recent thing in your memory.