I think there are 2 perspectives here that are conflicting...

To the high end hardcore raider minmaxer in a great raid group, RDM damage is less than a BLM or other hardcore DPS classes when played at that level. To this group RDM is fine as they aren't OP to a group of this level. In fact everything seems to be pretty well balanced.

The vast majority of players will never play with people that play at the level that FFlogs portrays however. At the average level DPS is nearly even between all classes and the addition of all the support to RDM makes it overpowered because they aren't being outdps'ed.

Point is most people who play this game will never meet a 90th percentile fflogs player let alone raid with them on a regular basis. At the average players level of skill it's RDM > BLM all day long...