This show's concept is very unique. A unique concept, especially one like this, can turn out not-so-well. This was really good.
Also, this show is fairly consistant with how good episodes are. There have been very few bad episodes.
The best part of this show, though, is the cast/characters. Such a variety of characters, and all played very well. Also, Matthew Perry is amazing, which makes this great show even better!
The first season of this show ended well, and I am excited for a season two that I hope and think will happen.