Chatter on the street says that they producer asked for it to be this way. They also say that there was no character designer for the anime, but they used the manga panels as reference directly.
(Take this with a grain of salt. I didn't bother to confirm.)
So, other than that, how is it?
Well, there are roughly three jokes:
Tatsu does something normal, but his affect makes people think he's up to criminal mischief.
Tatsu does something normal, but with a ridiculous intensity.
Gangsters are baffled by Tatsu's domestic skills.