I really wanted to like this movie. I went into it with, what I felt were moderate, but excited expectations. The trailers made it look like Clash had everything I love about movies: action, excitement, crazy monsters, hot men in skirts, swords and Liam Neeson. Sadly, while the ingredients for greatness were all there, this movie quickly disintegrated into a hot mess of cheesy mediocrity.
The action sequences are slow in coming. The script takes far too long in setting up the premise. Blah, blah, Gods, blah, blah Man. Blah, Blah. KILL something already! And then there is the problem of Sam Worthington. He is far too modern of an actor to be in a period movie like this. Also, while he does well with this action, you can tell he's sleepwalking through his lines for the paycheck at the end.
The editing is a mess -- with great boring lulls of uninteresting and worthless plot between action. And what action there is... well, it's too little too late.
The cinematraphy makes the whole of Ancient Greece look muddy and bleak. While Neeson and Fiennes do well to put some dignity in the proceedings they cannot save this Greek Tragedy.
If you're looking for an awesome action flick, save your money and see How to Train You Dragon instead.