Just plain awful...
The story was a bit on the cliche side but that didn't bother me too much because there are hardly any new ideas under the sun. But the writing was abysmal, the acting was sub-par and the special effects must have been pur together on an Apple Mac.
Gary Oldman was okay, don't get me wrong, but the writing didn't help him much. Heather Graham was... well, awful. Matt LeBlanc was nothing special either but I don't need to tell you that. The robot looked like it had been designed by sticking a few household appliances together. And the monkey-alien-mutated...thing...WTF! Seriously. I'm not even going to go into that! This should have been enough to make people think stupid alien things that make stupid noises are stupid but then a few years later we see Jar Jar Binks so maybe George Lucas didn't see this movie.
In conclusion, awful. I gave it a 3/10 because it was watchable but not worthy of a 4.