I been playing ARAM and there’s always going to be problems (leavers, AFK/bad players and trolls). It’s just part of the nature of online gaming. In ARAM it’s better to treat it like a game of poker. Wait for everyone else to pick their heroes, then decide. Why show your cards first and pick before you even see what you are getting into? I try to be nice and always pick the best hero (tank or healer usually) for the team ONLY if other people are picking ideal heroes.
However, if someone is going to pick something non-meta that has potential to cause us to struggle I’m definitely not picking a tank or a healer. Like maybe you’ll get a bruiser like Imperius from me if you are lucky. If I see someone picking weird stuff like Murky, Valeera or Samuro then I’ll pick whatever can do damage. Why pick a tank if you got multiple people picking Azmodans and Junkrat b/c OP ranged heroes are easy mode in ARAM? I’m not tanking (getting 5v1ed) while my team stays two screens away from teamfights vomiting ranged skills in enemy direction/padding their damage. I’ll pick something like Tassadar instead.
Choosing a healer or tank in ARAM if you see people picking low tier or trolly picks is just a recipe for a miserable time. I’ll pick what I want. You can leave and get reported as AFK/non-participation if you don’t like it. Thanks!