I've been lucky then as I'm que as a Tank and got no one complaining about my Tanking skills... I play a very dependable Tank in my runs.

Though it's something I like to see... mixed up a bit or changed a tad for the Adventurers or maybe add in a "second" Adventurer in need. Like the first one gets better and higher reward while the second one gets the current reward level. Maybe something like that which provides some balance and always other roles to be used for Roulette.