Most of these people just want to melee on the RDM for attention (*cough* ^ *cough*). I guarantee you if RDM melee were to get considerably buffed, these people would stop playing RDM and go play PUP or some other job that people don't want in their party.
Though honestly it's always like this in every game with the jack of all trades classes, the people that play them don't appreciate all of the parts of their class and therefore claim to be underpowered, never understanding the reason their class doesn't get 'fixed' is because gameplay balance is determined by 'pros' (AKA the people who are actually good [the best] at the game). People knew what they were getting into when they decided to play a jack of all trades class (never being the best at anything), yet you continually see posts asking for RDM to be "as good at melee as a WAR or MNK" or "as good at nuking as a BLM."

It's astounding. Really.