It's not without its good parts. *Knocked Up* starts out awkward and uncomfortable rather than entertaining, but eventually develops into something you’ll want to see. The plot is mostly funny and absurd, though it does have some sincere moments and ultimately delivers a hopeful sentiment. The actors are really well-chosen; there's a lot of recognizable talent involved. Seth Rogen, Katherine Heigl, Paul Rudd, Leslie Mann, Jason Segel, Kristen Wiig, Ken Jeong – those are just a few. It’s quite an impressive lineup. Even Don's friend Stormy Daniels has a role. I chuckled a few times, although it wasn’t laugh-out-loud funny; I did enjoy parts of it. Rogen and Heigl have good chemistry together, and she does a particularly nice job. I do think the movie could be shorter, though—comedies like this usually work better when they're around 90 minutes.

Source on TMDB