Unfortunately I didnt play the original (not sure how important that is to this story), but coming at this as being brand new game, I've gotta say it's amazing.
The good bits: The gameplay involves the perfect mix of gunfire and sneeking, as well as RPG elements like Weapon/character mods and talking to characters to develop the plot. The story is, for once, interesting and well thought out. Personally I can't see what all the fuss is about with people hating the hacking! Yes it does take a bit of brain power and it does help if luck is on your side but its good to have a bit of challenge. If you really can't do it then you just need to spend some points on upgrading your hacking abilities - thus making it easier.
The not so good bits: Voice acting isn't great. Adam's voice is ok, but some (not all) of the other characters are pretty poor. The animation when talking to people is pretty below par for today's standards - especially if compared to Mass Effect for instance. Your battery power doesn't replenish itself (the most annoying thing in the game) and sometimes when you look round a corner to shoot someone your taget reticule doesnt end up exactly where you thought it would (Unlike much earlier games like Rainbow Six). But that really is about it!!
What this game lacks in brilliant graphics, and even with the 2 things that wind me up with it - It more than easily makes up for them by creating an interesting and intriguing story, the perfect mix of RPG and action elements, some brilliant Bladerunner-esque environments & lighting and it's overal class.
If Skyrim wasnt out in a couple of months - I would be saying game of the year! A must have all the same!!