I've never seen an MMO this easy and idiot-proof.
-You can't mess up your character spec simply because you can't spec, you end up with the same traits and cross class skills as everyone else.
-You can't choose the wrong gear. Everything is just a linear line of progression of the same boring stats from level to level.
-You can't mess up your materia customization because most stats are useless or already capped.
-Skills and spells require little to no strategy in their usage, you just keep rotating the same line of skills over and over again regardless of what enemy you're facing.
-Combat, in general, is too easy. You can make it to level 50 without dying in this game. The only fights that are "hard" are ones that you haven't met the gear requirement for.