It's the same as with 300, and it's ridiculous depiction of "Persians" as some sort of mutated, modern day arabs. Definitely not propaganda or anything of the sort there...
(imitation GW Bush voice)
"ancient persians was the same lookin as modern day arab terrists! yee-haw!"
I would imagine people like the guy below thought 300 was one of the most "historicalest" movies ever.
And before anyone jumps down my throat, I'm a US citizen as well. Sadly, history isn't exactly an exalted study topic here in the US.
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