Because some people are of the mindset that you can't properly criticize something without experiencing it for yourself. Like it's easy enough to be part of the bandwagon and go "thing is bad and dumb" but it's another to play/watch/read/whatever the thing for yourself so you can form an opinion for yourself. That's how criticism works. 

Also I don't hate on Bethesda because it's edgy. I hate on Bethesda because I believe their games to be crap.