This movie is about a male scientist that, for a scientific experiment, agrees to carry a pregnancy in his own body (!). And while his colleague's former wife is also pregnant, he also befriends a nurse (and hilarious situations follows).
Personally I found the movie funny at times. I'll say to the haters ''Come on folks it's a comedy''. But I'll explain the reasons why I didn't rated this movie higher than 5. And it's better than the overall rating of 4,6 would suggest.
The pros: Schwarzenegger, DeVito and Emma Thompson were the strong point of the movie, they did the best with the material they were given. I liked especially the scene when Arnold ends in drag at a clinic specialized in pregnancy, and some weeks later along with DeVito and Emma rush to the hospital along with DeVito's wife.
The cons: The concept of a pregnant man can disturb many sensible persons, and I personally felt queasy about the subject matter. Thanks to the nightmare scene (although many wouldn't agree with me, I found it very funny). And the villain, played by Frank Langella, it's not a very believable villain, as he is defeated easily.
However I found the movie funny and likeable, but in some points shallow and silly. But this is not always a bad thing, like in this case.