Honestly I find MNK to be the most straightforward and simple DPS. Positionals can be damned if your not doing any serious content. You can't really mess up a combo like you can with DRG or NIN as its the most flexible 1-2-3 in the game. As long as you hit Elixir Drive on CD and keep Dragon Kick and Twin Strike on its ezpz.

Its like Ryu From Street Fighter. Extremely easy to pick up and learn. But if you got onto mastering it You have every tool ever needed.