I liked this movie much more than I expected. I believe the low rating here and on IMDb is due to angry religious people that don't like the atheism concept thrown in their faces.
Plot is a little weird, but is good acted and directed. It is funny indeed. At least a 7 is well deserved.
Normally I am a Ricky Gervais fan but I think he confused honesty with saying everything that pops into the character's head. The world created would have been much more believable and entertaining if they toned down the self monologue and focused on normal dialogue being brutally honest.
I like the idea of the movie and it's really interesting, but it would been better if people were telling the truth normally, most of them looked like robots talking. It was almost like they couldn't lie and they had no feeling at all. If the characthers told the truth like normal people, for me, it would been so much better.
BTW: I did not for one second believe that love connection between Ricky Gervais and Jennifer Garner. There was no chemistry between them whatsoever. In that aspect did the movie fail miserably. Enough to give it a weak sauce.