Any melee is going to have a higher skill ceiling in frontlines especially. In PvE I think the movement required is pretty similar between monk, samurai, and dragoon. The key difference is Monk is more severely punished for not being in the positional. Samurai you want to hit the positional for the bonus Kenki (which does effect damage output) where as Monk and Dragoon take negative effects. All 3 jobs when played properly are going to switch between flank and rear every combo to every other combo. Dragoon is doing it every combo if played properly and honestly the movement isn't that severe.

I see soo many people exaggerating the positionals when this guide breaks it down perfectly.

http://forum.square-enix.com/ffxiv/t...-with-MS-paint