Terrible! Cannot believe I wasted £25 on this.
The sound-effects are pathetically lame: Ethan's pistol, when fired sounds like someone walking into a door. You can almost picture the guy responsible for sound production: standing at a desk with a 1980's keyboard and implements that make noise in order to make some sounds! It's also a letdown that there isn't an ounce of talking in Mission: Impossible. I know there was no dialogue in Goldeneye for instance, but it seems stupid to not add any here, and Goldeneye made up for the absence of dialogue with such a supberb game.
The gameplay is almost non-existent. The ideas are good: enabling you to adopt another person's face then infiltrating a secret base for example. But that is about it.
Overall Mission Impossible is truly a waste of money, time and effort. You'd be miles more satisfied playing Goldeneye again and again than play this thoroughly. The only reason I gave the game 1 point is for the catchy theme tune at the introduction screen.