I'm not sure if it's just me being awesome at tanking but I always do 50-60% of all damage done in normal dungeons. It's only in heroics DPSers actually surpass me in damage and DPS, and even then it's only by a minuscule amount. I remember when I used to DPS in dungeons, being top dps or fighting to be was half the fun. But as it is now, it's not even a competition. Is it really necessary for tanks to have the same or higher dps than pure dps classes in dungeons? And more importantly, does tanks DPS capabilities actually ruin the fun for DPS specs?
Edit: I'm not talking about groups with full ilvl483+ DPSers doing dungeons for shits and giggles. This is more aimed towards doing dungeons/heroics with people who are pre-90 and pre-raidgeared.