You people realize that tanks ARE, in essence, just DPS classes right? The only thing that differs for them is that they are DPS classes who can take a hit without dying. Their primary goal is to smack things around though, which is the exact same as a DPS.

"But Velox, a tank's primary goal is to hold hate on things."

Yes, but how does a tank do this? By hitting things with skills! OMG THE SAME AS A DPS.

Really the only role that is fundamentally different is healer because a healer's primary focus is on the party. The rest of the party focuses on enemies regardless of "role."