Finished this game earlier in the week and I have to say, it's a fun game and much better than the original. While I liked the original game, this one was a lot better. The characters have good personality and often have geeky conversations that endear them quite a bit. The stealth mechanics are pretty good and it is often more fun to go through a mission trying not to kill anyone or do it in a way that makes you feel like Big Boss. The game dries up a little bit as you progress, but the missions are pretty well varied and I enjoyed them for the most part.
Overall, I'd recommend this game to anyone who has an appreciation for running someone over with a remote controlled forklift to complete a mission, that was one of my favorite moves. It's also a ton of fun to start a gang war or start a police shootout against gang members and just watch the insanity unfold.