Same characters for months on end. Same grind content for months on end. Spend up from to keep up and then grind to death when higher level. Lots of characters in the available pool... You will only see about a third in actual play, pretty deceptive. Pool of team mates should have date last active listed so dead weight can be purged.
Overall - $$$ + grind + lack of content = delete
The Biznez about Marvel: Avengers Alliance 2, v1.3.2