Although their have been mixed reviews, I can honestly say that this is a really enjoyable film. People seem to forget that this is hollywood, and the film isn't supposed to be broken down into little chunks and analysed.
If your looking for a well acted, and entertaining horror, then this is perfect. But lets get one thing straight - this film is a 12, and therefore there are no 'gorey' scenes. This more of a phycological horror, as you will find out when you watch the film.
In brief, the small crew of an underwater base are left without contact to the water surface due to bad weather. Upon discovering what appears to be an old spacecraft on the ocean floor, they look inside to find an odd sphere. The rest? Well that would be telling! The plot is great and the film keeps getting better as it goes an, and really proves you don't need lots of violence and gore to create a good horror film - such parts in this film being when a crew member gets killed by deadly jelly fish. I know, it sounds stupid, but when you watch it, it really does set your heart racing.
As for the script, I can't see any problems, although some reviewers felt the need to, again, analyze it and rip it apart as soon as something doesnt sound right. But its just right - not too many jokes, and taken seriously. Sharon Stone puts on a strong performance, and Dustin Hoffman follows.
I've given this 8/10, as its all round a good film. The star performer is Samuel L Jackson, who is brilliant. The special effects are nice as well, and if you DON'T take the ending too seriously, you'll see what a good film it is.