First, there are many things in this movie that make little sense. BUT it all comes together at the end. People who say this movie has no plot, and when I say this I'm serious, cannot have a very high IQ level. This movie, unlike its sequel, requires a sophisticated audience to watch it. What I'm saying is that you can't be stupid and understand the brilliance of this film.
Ever since the beginning of the show, it has always required smart people to watch it. It's a mystery, mysteries don't make much sense until everything is figured out. The movie itself is actually quite simple:
Ethan Hunt is working for the IMF. After one of his missions goes bad and everyone is killed but him, the IMF suspects he is the mole they've been hunting for two years. Ethan, being innocent, runs and hides from the IMF. He goes through difficult tasks such as breaking into CIA headquarters at Langley, making negotiations with arms dealers, and avoiding the law. In the end, Ethan finds that the mole is none other than his old boss, who had faked his death to frame Ethan.
Overall, I give this film four stars. It didn't quite reach five, a few lines didn't clearer make sense or agree with each other.