There is alot to like in this film, but if you can't bear Keanu Reeves don't waste your time, the film completely revolves around his space age courier.
Johnny is used to carrying around large chunks of information by downloading it straight into his brain and is well paid for it, but this time he has downloaded too much data and his brain will turn to mush unless he can get it out soon. Our hero ends up in a race against time and whilst he tries to save himself he encounters a resistance movement who have their own interest in the information he carries.
This is good fun. There are some interesting ideas (as you would expect from cyber-punk author turned screenwriter William Gibson) and they are well executed. The story itself is a bit daft but watchable and the actors do a fine job.
This is not a film that will change your life or make you gasp at its amazing vision of the future, but accept it for what it is, simple sci-fi escapism, and you should enjoy it.
Don't buy it expecting to see something similar to The Matrix, though. This is completely different story and style-wise. The only thing they have in common is Mr Reeves.