Trailer impressions: Doesn't look much like ancient Greece. Zeus looks he stepped out of 'Excalibur'. The hairstyles and costumes stink. We know what armour the Greeks wore; we know how they wore their hair. Mess with that too much and you wind up with cheese. Especially if you try and make it all look more, er, 'fantastic', as in those godawful breastplates. The guy with the crew-cut looks like a marine; but that's no good to me- I want to see ancient Greeks with curly hair. The gorgon looks good, though, especially the shot of her moving fast along the floor. But the kraken looks far too SF.
Who knows what the script will be like. I might one day, but only from a DVD rental, if I can be bothered.