The combat is really slow at early levels, but it gets busier the more off cooldown abilities you'll get. Especially the Heavensward (level 60) rotations keep melees and ranged DDs busy (in fact the rotations of some jobs have gotten so complicated they're planning to simplify them for next expansion). Maybe check out some gameplay videos for level 60 melees and ranged classes and see if there are any that seem to appeal to you?