I know this is the typical least favorite of the original trilogy, but I kind of have a soft spot for it. It's a good nearly non-stop adventure. Despite it being darker in many ways, I feel like it's also much more of a cartoon for better or worse. Complete with a goofy James Bondesque opening followed by a Looney Tunes scene of him trying to get the antidote.
Ripping that man's heart out is an instant classic. I also feel like you always remember it being far more graphic than it actually is.