I know there are a lot of Asimov diehards that found it disappointing. I don't know why. The iRobot book wasn't even really a book, it was a collection of short stories. Not exactly an easy thing to adapt to a movie.
The movie basically goes "there are 3 laws of robotics" and then its just action schlock the rest of the way. Also, iirc, it's basically a car commercial too. I think it could have explored the themes of the book more, but I dunno.
I remember really liking it, when I first saw it, but I was in high school, at the time.
It's a film (like many at the time) that's much more influenced by the impact of 9/11 than Asimov.
You'll probably be entertained though (it's certainly still a competently made film) so I'd say watch it; that way you can know what others are referring to and be in on the cultural zeitgeist.