xhonzi said:

I think part of the idea was: How much setup does a movie based on Greek mythology need? We all know who Zeus and Hades are. We all like giant Scorpions and Greek soldiers fighting. Put them in a box, let them fight... MAKE MONEY!

But it didn't really work, in my humblest of opinions.

I agree with you, but I think the studio COMPLICATED the whole thing beyond reason because it was the most cliche thing to do. They set up too much.

Comic relief hunters join the party for no reason.
Other soldier guy hates the gods cuz his daughter died.
The only guy who actually notices the gods DO exist and WILL kick your ass is protrayed as a crazy cultist.
Perseus has daddy issues.
Perseus "chooces" to be a man but uses all God powers all the time.
Zeus is both good and bad, but all ineffectual.
Girl cursed with immortallity.
Charcoal man is bad, joins the team for no reason and dies.

While the plot of the original isn't brilliant, it's elegant in that it isn't full of needless complications that add nothing to the overall film.

And for what it's worth, I thought the action was not fun to watch.