No spoilers.

Holy crap! This movie is as cool as expected; the action scenes are incredible; the mix of CGI, the visual style of the movie and the choreography lift the battle sequences to a higher level, which you won't see in any other movie. 300 could be watched entirely because of these scenes, but the part of the plot taking place back at Sparta is interesting as well. I think I'm gonna go watch it again now.

9/10

I know a movie like this deserves to be watched in a cinema, and I'm going to, so no worries. After watching 300 I've been reading a bit about the historical event from the movie, The Battle of Thermopylae, and 300 depicts the events more accurately than I though. You can read more on Wikipedia, just take a look at the casualties part, insane!