I would say that is extremely overrated. Quite honestly, in terms of movie-making, it's one of the worst I've seen. What little plot there is is continually interrupted by ten minute shots of props moving really slowly, high-pitch, ear-piercing squeals that go on for at least 60 seconds, bizarre colored lines that supposedly represent a wormhole (or something), really loud breathing, and on and on. The actors had every ounce of emotion sucked out of them. The murderous computer was the best character, in addition to being the only worthwhile part of the film, in my opinion. Yes, the special effects were good. Stunning visuals aren't enough to make a good movie. Without having read the book, the plot was all but incomprehensible.
That being said, the movie wasn't entirely bad. The visuals were genuinely stunning. At least, some of them were. The men in ape suits and the random colored lines left much to be desired. The spaceships were cool and surprisingly realistic. The idea of a rogue AI was good. However, without good characters and with the one good story idea relegated to a subplot that took up maybe a quarter or a third of the movie, it was just painfully boring. It's considered a classic, but it's more like an emperor with no clothes. If I wanted realistic visuals, music, and a few interesting ideas surrounded by an overwhelming mass of boredom, I'd watch a lecture given in a monotone with classical music playing in the background. That would me significantly more interesting.
Ok, yes, I'm a "hater" so far as this movie is concerned. But, really? A movie that is 75% watching props and special effects move to background music and 25% painfully slow action in which the only interesting character is a homicidal computer? I don't understand why anyone likes it.