The original one was a decent action flick as long as you didn't actually THINK about anything that was going on. Too many people outrunning explosions and fireballs, sometimes the acid blood would pretty much incapacitate people just from a little drop, and other times no effect... If the second one is anything like the first, I'd guess that it's worth paying matinee prices, and don't bother renting it unless you have a widescreen tv and surround sound. You're seeing a movie like that for the action and effects, not the plot or characters (or adherence to laws of physics).
