I have a problem with the way this show was advertised. "Makers of Friends" and an ad which had all the FRIENDS tag lines. They should have promoted it for what it is, and the rating wouldn't be this low.
I for one knew better and didn't compare FWBL to anything. And I enjoyed it. The casting is fine for me except for the engaged guy. I already know Kevin from one of my all time favorites Entourage. Not sure about Majandra, Brooklyn is most probably for the wow factor of the show. But Zoe Lister, you'll just love her cynic role.
It is just one of those sitcoms where the story is about the life of a group of friends, but no matter how many times we've seen this story (HIMYM, Friends, TBBT), we can never get enough. I for one, connect best with Zoe.
Overall, I'll definitely follow this show and see how it turns out. And you too should give it a chance. It's not FRIENDS Part 2, it's a NEW SHOW! 9/10