Given Nakamura's inclination of working on intellectually challenging and thoughtful projects, it is strange that Colorful is so lowbrow in just about every aspect. Conceptually, a satire of overblown sexual content in media sounds pretty juicy. However, in practice all the jokes end up being lewd and crude, rather than being witty and insightful as satires usually are. No doubt this is due to the subject matter of male fixation on the female anatomy. To put it lightly, the male gaze is prevalent in this show; it's naked women galore, with plenty of focus on butts and boobies. Much of the comedy centers around men getting distracted, or acting stupid and perverted, after catching a glimpse of some girl's cleavage. Amusing certainly, but it's hardly sophisticated satire.
The humor also ends up being rather limited. There is only so many ways to depict male lack of judgment being spurred on by hot women. Granted, the show does play around with its pervert humor in creative ways and can be inspired in its lunacy (a giant school girl trots through a city, and all the men are focused on her panties), but it is basically recycling the same joke over and over again. In a way, this is actually counterproductive, as the show itself indulges in the voyeurism that it is lampooning. Although the episodes are only 5-6 minutes long, it is good to take time between episodes instead of going right into the next one; the perverted idiocy of the men in this show can be taxing, especially when taken all at once. That said, the show becomes more enjoyable in small doses and the show does provide a few chuckles and maybe one or two big laughs. Still, it's almost entirely brain-dead humor and if you can't open to its self-aware dumbness, then you probably will not like the show.
Colorful was clearly made cheaply. The animation is stiff, and the character designs are janky. There is (naturally) more detail put into the girls, especially their 'assets'. Even still, they're hardly the most attractive anime girls. Nakamura's direction crude and undisciplined; the complete opposite of his usual work. With its nonsensical tangents and bouts of obnoxious wackiness, Colorful is more akin to adult swim shows like Tim & Eric than other anime. That's not a compliment. It sort of feels like Nakamura was just screwing around, which would be fine if what he produced was quality work, unfortunately it isn't.
In all honesty, I can't say this is a good show. It is far too dumb to be a successful satire. Its humor is hit-or-miss, as well as being repetitive. It has no characters or plot to speak of; it's just a cluster of dumb jokes that occasionally hit the mark. There is enjoyment to be found if you let yourself sink down to its level, but the fact that I used the words 'sink down' is an indicator of the show's quality. It's a small but notable hiccup in the career of a rather talented director.
