I'm ok with 'Jack of all trades' type classes that can essentially do it all, so long as they are not over powered and don't specialize in anything. There are games out there that fit this kind of class perfectly. In FFXIV, I would say the tank jobs are capable of doing a little bit of everything. They have high HP, defense, ability to mitigate damage, self heal, and deal damage in an offensive stance. What I enjoy is that even though they do have all that, they won't get very far on their own in punishing content without a healer and DPS players sustain their health and damage to the opposition.

In short, I like the concept of roles, and it's a big reason why I play this game. If I wanted to play the 'I can do it all' type of class, I would rather just play a single player console game.