OP, just appreciate that you had great dps and thank them for making you work so hard and making the run go faster instead of getting so flustered! Ask them if there's anything you can do better and tell them how great they are doing. Dps so rarely get compliments in dungeons. It feels awesome to rip hate off a tank and have them say, "Wow, not used to such great dps!" Usually, tanks get angry when dps are making them fight for hate. A tank who shows they are having fun trying to up their game to compensate regardess of ilvl or skill will always get my commendation for being a good sport.