I had been looking forward to this one since I saw the first trailer ages ago. It really showed some moments of awesome, and it had the potential of being 300-2. However, I was a little disappointed with the pacing (a bit too slow in my opinion) and I was surprised that I wasn't surprised about the ending (if that makes any sense?). Special detail was paid to the aesthetics, with interesting compositions and scene transitions, which is always glad to look at. It has one of the best speeches pre-war that I can remember (you could see that one from the trailer, although it's better on the film), and some scenes have been improved since the trailer (the break-rock-and-unclick-apart effect doesn't exist anymore, and it's now a much better scene). Anyway, it's worth a watch, but it's not the homecoming of the second resurrection of the Greek Gods. Oh, and definitely better than Clash of the Titans.
