I have basically pugged everything M+ related excluding a handful of runs because of the occasional "i'm doing a X, wanna come?". I'm nearing KSM, trying to get some 14s done and then start tacking the 15s. It's annoying but doable, albeit slow. In the other side, it's compensated by the fact that people is more geared over time and got some more knowledge overall.
I don't hate M+, but i also don't like them. I find them boring and stupid, it's always the same thing just with inflated numbers. I do them because of gear, and once i got the KSM, i'm gonna stop at 15s because i just want the items, i have less than zero interest in pumping a score that doesn't give me anything worth in return.