Back 4 Blood, opinions
Honestly surprised how much "the original developers behind Left 4 Dead" don't know about how Left 4 Dead works and what makes it good - I'm not even through Act 1 and the pace is horrible, the levels are easy to get lost in, the AI is dumb, "mutants" are spongy, the guns feel horrible, etc etc
Back 4 Blood, opinions
What makes Left 4 Dead work is clear level design that always funnel you towards your goal, and make it clear how to reach it - you prepare in the safe room, you roll out and steamroll your way towards the next safe room, and then you repeat it again for four levels.
In Back 4 Blood there's so much mechanism bloat pushed in just to differentiate it from Left 4 Dead, you start in the safe room, you have cards that change how things play out, you have way too many weapons, some are in the shop, a lot are out in the world, they have attachments, maps suddenly start having subobjectives, it's just a mess!
Playing Back 4 Blood just makes me want to fire up Left 4 Dead 2 again.