Not a good movie by any standards, but it was a bit of harmless fun for sure, considering its genre was raunchy humor, and not romantic (well, I guess they were going for a mix of both). Sexist for sure, but perhaps the intention was to play it for laughs, as most raunchy comedies aim to nowadays (truthfully, since the days of the 'Carry on' brigade, all the way to 'The Hangover', via the works of Apatow and his ilk), and is not meant to be taken in earnest. Doing so would constitue missing the point of this genre of comedy, esp. the aspects of dark/oddball humor (Zach Galifianakis' bare butt in our faces on the 70mm screen, anyone?). Being bloated and unkempt, Butler was 'in character', and I thought, he did a good job, within the confines of his material. However, as far as Heigl is concerned, she should perhaps take some notes from survivor Sandra Bullock (in this summer's trainwreck of a movie, 'All about Steve', she almost loses the audience, yet salvages a little something towards the end - was able to see that because I didn't walk out on cue, most of the audience did).
Pros: Butler, Some hilarious scenes, The host of the late late show doing his thang, Some interesting directions the script takes but never fully realizes
Cons: Lame/predictable/asinine plot, Boring/Familiar situations, The 'human' side of Butler's character, The 'too pat' ending