Yoru no Yatterman starts out full of promise. The premise is interesting, the execution spot-on, some themes and ideas are tossed around. . .
Then the halfway point happens and it's all downhill from there. We fall into some Saturday-morning-cartoon tropes, cut some corners, repeat some frames in the finale obviously enough to make one cringe, and all in all the show ends up being a bit of a letdown, really. Too many dumb jokes in quick succession, and it's all the more disappointing because the first half was so great. Even the ending seems to be an afterthought and felt to me like something of an easy way out after everything the show had talked about up to that point.
If I was rating the first half of Yatterman, I'd give it an 8. But I'm rating the whole thing, and the whole thing disappoints. There are some good points in the second half, but they're meshed with some really tired and cliche points. During some of the last episodes I felt like I was watching two shows at once.
So where am I going with this? Yeah, watch it if you want, I guess. The first half is pretty great. Just warning you the rest is something of a let-down.