Assault on dragon keep is a must play, although I think it hits better if you’ve played through BL2. Which you should, because the story and dialogue is the best borderlands has ever been.

I agree the classes felt very samey. Too many abilities are just percent buffs. Too many ults are just “burst”. I think the concept is solid though which is why the news of Wonderlands 2 gets me excited. Wonderlands had a lot of novel ideas that could use some iteration and refinement.