Usually comedies have not a high rate because we tend to judge every aspect of a movie.
My rate is just for the laugh I had almost during the whole movie. This is not an intelectual or great one, but damn, it reaches his goal: laughing and have a really good moment!
It's french and have the "french humour", so you will appreciate it much more if it's your "cup of tea". You can see it with anybody since there is no explicit moment that are used too many times in other titles.
I don't recommand to see the trailers, since it reveals some jokes. But don't worry if you did it, there is plenty more in it.
(French speaker here so soory for the bad english)
Review of A Very Bad Friend
