Thanks Ale... that's pretty much what I was looking for.
I can understand why those who were fans of the short stories were disappointed. It's the same way I initially reacted when I first saw 2001: A Space Odssey. I'm a huge fan of the series and have read all 4 books multiple times. Most people aren't aware that there are 2010, 2061, and 3001 Space Odysseys. Unlike most people from this generation, I read the book long before I even realized there was a movie. Needless to say, I was sourly disappointed when I first saw it, and even more so when I realized that most others liked it. So I watched it again and removed all bias that I had developed from reading the book and watched it trying to forget, as best I could, that I had ever read the book. And you know what... I liked it. It took me having to remove by pre-existing bias and seeing the movie as a standalone work for me to appreciate it.
I don't think it's true that most people dislike I, Robot. I believe it got something like 60% on Rotten Tomatoes and 77% from users there. It seems that quite a number of people who didn't like it derived thier dislike from their experiences with the short stories. Those who had no knowledge of the shorts stories overwhelmingly liked it, or at the very least, found it entertaining... far from finding it a horrible movie on par with Wild Wild West. We must be careful in mistaking our bias in favor of previous works for "taste and knowledge about cinema."