Forgetting Sarah Marshal
In the same vein as Knocked Up, 40 Year Old Virgin, it's the same group of guys doing the same old "guy's romantic comedy". I have to admit the formula is getting a little tired for me, but overall it's still pretty darn funny. There weren't as many crazy funny moments as the aforementioned titles, but it still had it's moments. There were quite a few pop culture references, which are funny now, but in 10 years will act as a differentiating factor between elitist know-it-alls and regular people.
Overall I'd recommend watching it on video if there's nothing else out, but not really worth going out of your way.