I think this is a hilarious idea. Maybe it's because it's relatable to a certain extent; everyone's been in a position where they wanted to act like these guys, but we know we can't because of the consequences, i.e getting fired. It's funny to see these guys being rude, obnoxious, and idiotic without suffering any serious consequences because I feel like acting that way sometimes. I'm also enjoying the characters' unrealistic behavior in a realistic setting. It's funny to see them openly not giving a shit even though it's their jobs that they get paid for.
There are a few things I don't like about it though, namely the character Yoko. I just really hate everything about him; his voice doesn't fit his character at all; it sounds like some red neck doing a half-assed Japanese impression. For a character who seems like something of a stereotype, his dialogue doesn't seem to reflect any Japanese culture. But The worst part about him is his annoying high-pitched laugh. It seriously makes me want to kill myself whenever he does it. My advice is to either drop this character from the show or reform him (change the voice, introduce some culture to him, and for God's sake, get rid of that laugh!).
The animation is good; my one criticism is that it seems kind of static to me; It doesn't seem like the characters would have the ability to move around fluently if they ever needed to. Given the premise, that might not happen often, but I think having more flexible animation will really make it come to life.
Overall, I think the show is really funny and really well done. The only flaws are the character Yoko and somewhat limited animation. I hope to see more, and hopefully see some improvement over time. Keep it up!