I was happy with the show from the beginning, but the critiques of bad writing were fair. The writing in the first 4 episodes started out as being pretty predictable and lacked anything that made it stand out. The show was definitely riding on perfect voice casting and a relatively fun concept.
After watching the most recent episode, 5, I think that it's finally coming into it's place. The characters are more fleshed out and the conflicts they encounter spawn some pretty good jokes. I feel like this was the first episode where there were original jokes and an original premise with the Chrissy and Laura plotline.
I would love to see more from the show and think that the potential is there for it to be a great adult cartoon. Unfortunately the general consensus doesn't offer a positive outlook and I'm pretty sure the show will end up being cancelled soon enough. Hopefully more people will give the show a chance rather than write it off as a dud after only 4 average episodes.
I recommend checking it out, despite what a lot people say.
Edit: Easy 9 at this point. 9 episodes in and I'm hooked. The story gets really good and the animation is great. All of the side plots have been hilarious, especially with the Rats vs Roaches plot.