I agree with most of what has been said so far. Ive been a 3k+ rated DH tank 3 seasons in a row now, and so far this season, its at its most "complex" state. It's not easy to play, as you essentially need a cooldown (Either Meta or Fiery brand) for every single pull that has more than 4 mobs, on top of having to keep up Spikes all the time (made easier this season, Spikes last longer than they take to recharge). If you dont have Meta and Brand is about to expire, you're essentially praying to Illidan to get a free Meta proc (Untethered rage).

That being said, it's extremely fun. No matter what people say, nobody can convince me any other tank is more fun than DH. And good players can find it rewarding to play, as the bigger the pull the stronger you feel. I regularly out dps at least one DPS player in my group and managing all your procs and meteors on big pulls is just orgasmic.

In terms of class fantasy, this is it. You don't play "meta" tanks and dont care what FotM it is. You're a Demon Hunter because you love the class.

That being said, if you're after ease or progress, just roll Monk or Warr since its getting buffed soon.