Want to see Clash of the Titans? Do you really, really, really want to? OK then. Go, see it. But don't waste an extra $3-4 renting those crappy glasses for a movie in which the supposed 3-D affects don't stand out, nor the acting. Do not expect Avatar-like effects. Do not expect good acting, even from Liam Neeson.
Do not expect Sam Worthington to appear especially sexy. My girlfriend might leave me for him given the chance (I believe he is on her celebrity OK-to-cheat card), but even she didn't enjoy this shatsterpiece.
Rent the original Clash.
Image from Wikipedia's entry about the soundtrack.