It's amusing, but also silly and half-arsed. There's some dark stuff buried in here, but the show's determined to play everything as light and kiddie as possible. (Apparently the original light novels have darker comedy and family-unfriendly content, e.g. Marie being a hard drinker.) I enjoyed the show, but it didn't hold my attention very hard.
If you liked, you could call it a parody of overpowered fantasy protagonists. The show's hero, Lloyd, is an extraordinarily good-natured boy with the power levels of Superman and zero awareness of this. He thinks he's weak, because everyone else in his village is stronger than him. (This is true. It's one hell of a village.) He wants to be a soldier, but he worries about whether he's good enough. (He could trash an army single-handedly.) He hero-worships everyone. He tries to help the world and will comedically miss the point on actually meeting a villain. He'll think they're cosplaying or something. He'll end up surrounded by girls who want to jump into bed with him, but he's too stupid and innocent to realise.
Theoretically, this is a bog-standard light novel protagonist. In practice, it's funny. Lloyd's a comedy idiot, not an audience identification figure. He takes "modest" off a cliff. He's oblivious to everything. He's the best thing about the show.
Other characters include:
1. SELEN = ever-loving yandere psycho with her magical red belt, who at one point was about to murder a potential fiance she hasn't even yet met simply for not being Lloyd.
2. RIHO = one-armed mercenary who's mostly interested in money. She has a mithril prosthetic arm.
3. PHYLLO = emotionless martial artist who'll decide she wants to marry Lloyd because he beat her at arm-wrestling.
4. MARIE = young witch who looks after Lloyd and gives her somewhere to live.
5. ALKA = immortal, all-powerful witch who's been alive for centuries... who likes goes around in the form of a little girl and fancies the arse off Lloyd. She's also an irresponsible idiot who doesn't even bother remembering all the daft, petty things she's done for stupid or perverted reasons.
There are story arcs that could have been quite good if they'd been taken more seriously. There's dark backstory that the show's fairly offhand about. There's also a stupid non-interference rule in the first few episodes that seems to get forgotten later on.
To be honest, the most memorable thing about the show is the harem comedy. It's quite funny, sometimes, especially since we're not meant to take it seriously. The hot spring episode (ep.8) has comedy red belt censorship. Selen will scuttle up walls like a cockroach and try to murder someone for trying to put a hand down Lloyd's pants. "I could firebomb my house, come back and go on a date with Lloyd!" All these girls could flatten a squadron single-handedly, especially if you let them use their magic. The show's good-natured and happy, but it's also the kind of series where you could sleep through an episode or two without realising, because none of it matters. In fairness, a much more dramatic version of this story could have been made... but that didn't happen here.