I have a very simple reason for hating Concord and being slightly happy that it failed: They bait-and-switched the hell out of all of us with that reveal video.
You can’t build up an interesting world filled with characters like that and then give us a PvP-only hero shooter. Who do you think you are, old Blizzard?
You being very generous by calling the characters interesting. The character line-up was the most generic, by-the-numbers GotG ripoff I’ve ever seen.