Well what kills me, is its really a pointless measure unless its a tank and spank. 90% of content you dont get to just sit there and burn a mob. The more mechanic rich a fight is, the less value there is on DPS, stuff like the last boss in Quarn temple come to mind. Sure you need dps, but you need to be doing 20 other things at once.
Average WP SR, not a tank and spank, sure you can compare DD1 to DD2, but tank is spamming ae agro and defensive cool downs and doing very little dmg, and healer is either spamming heals or 1-2 holys.
Non-SR wp: First boss is tank and spank, and you can compare dd1, dd2, tank, healer no issues, Last boss though, DD1 is on boss, DD2 is killing adds so saying DD1 did more dps is a silly metric, because DD2 is having to space out add, kite, wait for spawns, etc.