It's a risk to switch everything completely (storyline, characters, settings). But with the way last season ended, there's no way to continue the story & make it good. I think it was written as a one shot deal & they were surprised it got picked up for another season.
I'm a fan of season one, but I'm expecting a bit of a drop off in season 2. Season 3 will much better given that they're probably working on the storyline now.