There are some interesting fights with some tact that were definitely enjoyable, but the characters won't shut up because they have to remind you of their singular character trait every second. That's not to say all the characters are bad, just that the main protagonists range from average to bad (although I would say they aren't worse than the average anime, in that the average anime has bad characters).
The main four characters' personalities can almost entirely be described as: lawful good/goodie two shoes; mute-shy girl (which also almost describes two other characters); cowardly, whiny/annoying, and obsessed with girls; and dumb, angry, loud man who tries to fight everything.
Weak characters aren't always an issue in anime, however, this one doesn't do a good job of anything that could remedy it or consistently distract you from the issue. However, I don't think that necessarily brings this anime down a lot, it very much depends on your tolerance for this kind of thing. Personally, I didn't mind it too much, aside from one of the main characters, the whiny and annoying one for the very fact that he was whiny and annoying.
The sound design is good but nothing to write home about, but it is none the less good. The OP is pretty decent.
Overall, I would say this is definitely worth a watch if you haven't seen it and have run out of things to do. It's the kind of thing you would while doing something else, though that would have you not pay as much attention to the animation which is the best part of it, and having to read subtitles would limit the things you could do while watching it.
