I have been raiding moonkin since TBC, and luckily I had a raid leader friend. He was understanding of moonkins and the poor itemization we suffer from (especially in TBC, remember?), so I never had to struggle with Cloth being locked out from my gear choices.
Since WOTLK though, I have hopped around from guild to guild and pugged more and more. I find some leaders very allergic to Moonkins rolling on cloth loot. I find this issue annoying, as some of our BiS are cloth and most of the ICC leather is Resto itemized.
How do you guys feel about cloth ? Does your raid leader let you roll on-par with other casters ?