this kind of thread never end well
each players have their own expectation
for example, doing DF I expect the minimum would be doing their role, i.e. tank holding aggro and def buff, heal keep everyone alive, DPS perform adequate rotation and dmg buff. Above that I consider bonus, especially in DF I am queuing with 3 complete strangers, I have zero idea about their abilities, I would rather be safe than sorry, wiping will waste more time than doing it carefully
but some players expect more like tank stance dancing, heal go full on DPS etc
there aren't any written standard, and it is not so black and white
a player that does not consider good player would not suddenly make it a bad player either
however, I think we would all agree some type of action would definitely consider as bad player,
like intentionally trolling which could be face tanking every AOE and expect heal to take the burden, DPS just spamming 1 single skill, continuously using knock back, always running ahead of tank, or rushing through everything without waiting other players etc
or thing like bad attitude, this would happen to any player, veteran, newbie, well equipped, or someone just began
however to what extend consider to be bad players, everyone have their own indication