In my opinion, anyone saying OW2 is worse than the original is saying this for personal reasons and not trying to be objective. OW2 is, in my experience, much more balanced than OW1. Many of the more frustrating aspects of the game have been fixed or removed, and most of the characters added since OW1 seem fun to play and not frustrating to play against.
There are very many valid criticisms one can make of Blizzard. The history of being a shitty workplace, the objectively awful decision to make OW2 a sequel, the treatment of Jeff Kaplan by execs, the monetization, and probably more. None of those criticisms (except monetization to a limited degree) have anything to do with whether or not OW2 is a bad game or not.
But I’m speculating since the person you responded to has not elaborated on any of their views.