I started this last week and I wasn't sure about it. The first episode felt like it was trying way too hard to be mature. (How many times can we get our characters to say Fuck and Shit? How much blood and gore can we mash in? We have to convince the viewers that we're super mature and cool, you guyz.) But there was JUST enough that I liked about it to give it another episode. I'm four episodes in now, and I really, really like it.
This falls in line with the general consensus opinion.
I actually don't think the show so much dials this down as it just takes time for the shock to wear off.