"harder instances" hahaa it's chapter 3 all over again, except instead of scouts it's wardens. And easier yet the warden's don't need a tank or a healer, they can do all that themselves. lol
You can pick your class as wisely as you choose, but it's completely indeterminable what class will be op next cap increase, and which ones will or won't receive the nerf hammer.
As to whether or not you wanna play again, it's all up to how much you wanna put up with the game truly. It's not the best game out there, but if it's what you are looking for give it a shot, nobody will hold you to it. It's free

...right?