I think that you need to set proper expectations before viewing this. It stars a bunch of Playboy playmates, so don't expect the best acting, or much of anything else for that matter. The humor is definitely not the most intellectual, but in my opinion it is no worse than say.. Scary Movie or any of those other 'spoof' type of films. I think given the actresses and the context of the film a lot of people write it off immediately, but I merely see it as a low budget version of many other movies that I really don't think is very funny at all. If they deserve a 5 or 6 on this site, this is no worse than a 3.
In the end it probably isn't worth watching unless you have a lot of spare time or is a fan of one of the girls starring in this, but it can provide some decent amusement if your standards aren't too high or if you just like really cheesy humor.
In the end it probably isn't worth watching unless you have a lot of spare time or is a fan of one of the girls starring in this, but it can provide some decent amusement if your standards aren't too high or if you just like really cheesy humor.