I was debating whether to give this movie a 3 star or a 4 star. Too bad Amazon doesn't let you rate in 0.5 stars.
I liked the movie overall, though I admit the main reason I rented it was because Jean Reno was playing the couples therapy guru (loved his role & performance).
Vince Vaughn's character would probably be considered stuffy and uptight for a comedy, but unfortunately he just happens to be my type and I'm biased towards him.
I found Jon Favreau's character hilarious and fun for the most part; he would've been my favorite character, had he not thrown some very personally off-putting offhand remarks.
I feel the movie didn't do Faizon Love's character justice; least development opportunities IMHO due to his physical condition and the fact that his "spouse" is a party-girlish young woman who's way too young for him; it's as if the film put Shane there, just so there'd be a token minority. And the backstory with his ex-wife lacked the most substance - can't feel for their successfully newfound love (except the fact that it's simply stated so).
Jason Bateman's character all but ruined the entire film for me (would've considered purchasing it if I didn't had him so much). I just downright loathed his utterly self-centered and self-absorbed personality all throughout the movie. He was probably (intentionally) helpful ONCE in the entire film for something that he didn't have any personal stake, and a real jerk the rest of the time. I would've much better preferred it if Jason got things a lot tougher than everyone else in the end (and actually had to work much harder to earn his happy ending).
Also, I wish the wives had a bit more of their own personalities, too (with the exception of Trudy). I didn't find Malin Ackerman, Kristin Davis, and Kristen Bell's characters really standing out as unique individuals, like their husbands (contrast how the wives interact with each other or when everyone else is around, as opposed with the husbands).
Then again, in the end, this is just a light romantic comedy, and a pretty short one at that. Maybe I'm setting standards too high.