The movie, other than all the dramatization, was reasonably accurate from a historical perspective. There were 300 Spartans. There were also 7,000 Greeks, but after several days they left.
The Persian army did number in the millions, and with only a few casulties, they killed several tens of thousands of them in the first few days.
Unfortunitly, like in the movie, they were killed by a shower of arrows after the Immortals failed against them, since nothing the Persians had could compare.
Kach, do some more research... and not just on Wikipedia. Mmmkay?
The film was freaking amazing. It may have been the drugs or the girl with her hands down my pants but lemme just say that this was movie-going experience I won't soon forget.
Let's not verge on spoilers here, folks. Some people haven't seen it yet.