Let me start of by saying: Do not watch this because you want to see Jean Dujardin! Since he won the Oscar a couple of months ago, I'm pretty sure the demand on his movies has been increased. But this is not a Dujardin vehicle. While his character is pivotal to the whole story, he himself will not appear in it for a long period of time. I didn't count the minutes, but his screen presence does not warrant you to watch it for him alone.
Having said that, I do hope you watch it for what it is and all the other wonderful french actors that are in it. One of them being his "partner-in-crime" in his newest movie (L'Infidels). The story consists of every character having something inside them, wanting to burst out. Some are subtle about it and some are not. I think the character who is the loudest might feel to be the most annoying one, but the actor walks the fine line of still making him sympathetic enough for us to care. A really good drama, that will find it's audience.