There are a lot of bad trek episodes scattered across every series. Bad episodes isn't the issue with Discovery. The issue is that, throughout all of trek, the crew has come together and stuck with each other through thick and thin. If there ever is inter-crew strife, it's solved in generally one or two episodes (except for major plot/story themes like the Maquis, or Seven being a Borg).
Discovery, on the other hand, is a show where the crew was constantly backstabbing, betraying, lying, and being all around bad towards each other. There was no finding solace among the crew in a world filled with strife -- the world was strife, and the crew was also strife. And whenever the inter-crew issues seemed like they could finally be resolved, some new stupid issue was shoehorned in. It was unbearable to watch because of the forced melodrama.