I use recount in WoW, but most people know it is a bit broken even in WoW, it is ok, but in no means is accurate enough to tell if someone is doing good DPS or not. You compare version of people's data-sets and the number sometime don't add up the same. Damage done is a little bit closer to the truth than DPS. And even then DPS is not a good standard. Some who is dead 90% of the fight can have a higher DPS score than someone that survived the encounter by a large margin.