This also plays to your benefit though. The "differing play styles" rule also protects people from being stuck with a player who would make any instance needlessly long or difficult by not performing their role properly. For instance, I once had a party in Rhalgr's where I found a new rare variation of The Ice Mage: the Thunder mage. No joke, this guy used everything under the sun aside from fire / blizzard spells - sleep, scathe, lots of drain, but mostly pelting enemies with Thunder spells. After asking him why he was doing this, and requesting for him to play his job properly as he ought to know how to do at level 70, he told us we needed to do OUR jobs correctly. So we promptly kicked him and finished the dungeon with the three of us. Hilariously enough a fourth dps joined us only after we started fighting the last boss, and was treated for his time with free tomes and all the loot dropped from the final boss, and our comms because why not lol