RDM is fine for progression groups but other than that they tend to get shunned. Since many groups are already on farm for this tier you'll likely find less PF groups for progression purposes.

Melee wise, go with NIN if you like to be the "go to" class everyone wants, have the best utility but lowest melee dps. Go SAM if you want to be a selfish (I don't mean that negatively either) dps that puts up the highest numbers but no utility. Both have that weeb factor. NIN is more complex to play and more reliant on internet speed/stable connection as well so there's that.

Every class is mostly controller friendly but certain classes, even though they have a smaller amount of skills in their main rotation, have a lot of oGCD's or several needed for one use (NIN mudras/AST card management) so they tend to have more clutter. Still do able though you just need to situate everything to your liking.