Be sure to not judge AoC by the first 20 levels because that is the intro to the true game. IT is well executed story driven content that does a very good job of immersing you into the world of Hyboria.
Unfortunately once you've completed the Tortage story content, the game becomes less story intensive and much more grindy w/ quests where the story tends to fade into the background among the kill x amount of this, though you're not really sure why you should other than the fact that you need xp to progress to the next quest hub.
The rest of the game is not what the beginning makes it out to be, so if you plan to use the trial to make up your mind, then be prepared because it's not always what i seems to be.