I have seen a lot more apathy and bitterness towards Shadowlands than any previous expansion, and I am sure it is because of the disaster of BFA. Which is fair. I myself was not very excited at all when it was announced due to the cinematic being disappointing and the features trailer underwhelming, but over time my hype has only increased as they revealed more about what the game would have in store for us through Alpha and the like. For BFA this was the opposite.
I see a lot of complaints about system bloat but...there really aren't many systems, I dont' consider features of covenants like the anima conductor a separate system, it's just a way to access world content through the covenant system/sanctum. The legendary crafting is a "system" I suppose but it is very simple to understand.
I definitely agree Covenants will be an issue for many players, but I will pick the one I like most regardless. However, I do think Blizzard should make it so you can pick one covenant and choose to mix and match all the covenant abilities but with the covenant of your choice having a spell effect (EX: Venthyr teleport will be you falling into a grave and arriving at the target location)
The content itself looks amazing, the player agency looks fantastic to me, and BFA had obnoxious systems but my biggest issue was everything felt like Legion but worse, even the dungeons and content, it felt so low effort in comparison. I think Shadowlands look much more like its own thing with its own take on previous system ideas.