If you have a weak stomach, you will not enjoy it, but if you like bloody battle scenes with limbs and heads flying after being slashed by swords, then you will love this movie. Do not expect any realism here, the movie 300 is more of a graphic novel adventure, mixed with Lord of the Rings epic battles, Gladiator like sword and shield fights and exagerated monsters.
The movie was not cut up as bad as I thought it might be by the Kuwaiti censors. The storyline was barely disturbed.
Here is a little preview of 300 with some blood spattering scenes (not the trailer) from youtube: