The good: Action was pretty good, 3D didn't feel gimmicky, sets and atmosphere were immersive. And Theseus was a likable character.
The Bad: Just about everything else...I liked the story as a whole, but the execution was terrible. Many many flaws in the story and characters pretty much ruined it for me (such as Hyperion's character in general, Theseus having the bow for like...5 seconds, the ill placed and executed sex scene...and so on). I think what pissed me off the most is that as soon as I heard the words "Gods" and "Titans" I was expecting some epicness in character designs, special effects, and an amazing last battle...instead I got some gods that look like they stepped out of an Abercrombie ad fighting some 3rd world tribesmen in 300 style combat.
Overall, I can't say I enjoyed this movie. I really wanted to like it and my hype meter was all the way up...but it just didn't deliver.