Pros: Decent animation, decent story, decent characters, likeable characters, light humor
Meh: Anything not important to the story is glossed over or lacks detail, story is childish
Cons: None
I just watched the first season and enjoyed it from the first episode. The main character is just plain likeable. He's easy to identify with, and root for. As he is a human from "our" world, you imagine acting the same way he does in a foreign fantasy world, and that seems somewhat believable.
The story itself is kind of childish. You know the hero will always win in this way or another, and yet it is fun to watch it happen. So many people just trust each other for no reason, but you take it as part of the story. There's always this wonder of what will happen next, like a daydream where everything goes your way.
The graphics are nothing special, but decent. There's just a little cgi here and there, but it blends in well. The music is nice too. Overall, everything in the story is decent.
In general, some stories always make you want more, other are episodic and can be put down at any time. This one falls in the middle, where there are no real cliffhangers, but you still want to see the overall goal come to fruition.
If pleasant, feel-good anime is your thing, definitely worth the watch.