Sure the dps aspect of Ret might not be 'fun' but I think if you play the spec to its full potential you are doing 1. The most dps in the raid and at the same time 2. Carrying hard with all of your support abilities, LoH, Aura Mastery, HoP, etc
How is that not fun?
Edit: I guess that its just me. I personally enjoy doing top dps and saving the raid from a wipe by Laying Hands the tank at BQL with just me, tank and 2 dps and BQL at 10%. DK hero class? Naww its a Ret.
The only problem is so many nubs rolled ret and donated BiS, you will have to prove your abilities in a raid, otherwise people will just look at you and be like lol FOTM. Which also makes a special appeal to playing ret at Wotlk. You can definitely outplay the vast majority of other rets if you do more than just 123 Wings. Its kinda amusing :P