When I first started I hated the idea of playing casters. I leveled every melee job and avoided all the ranged ones (MCH & BRD still had the cast thing back then) before trying any of them out. It's a completely different play style for sure but now after leveling them all I can definitely see the appeal. Early on jobs can be pretty rough. I would recommend taking a job into Palace of the Dead just to preview what it's level 60 abilities are. You won't get an actual real perspective of how it plays there because the content is structured differently, but you can play around with more abilities and try stuff out.