Replaying it on supersoldier now,nanosuit upgrades transfer from previous playthrough.
You can only have one active per slot(power,armor,etc) so spend nanosuit points wisely.
Some story comments
Game has beginning and the end,you will still have lots of questions,but there is no cliffhanger ending...it will give you hints about Crysis 3,but Crysis 2 fight is finished and it all ties up to Crysis nicely.Story is not Charles Dickens,but it's executed pretty well,it just flows.
Some gameplay comments
If you like sandbox type shooters,look no further...play as you want(stealth,one man army,sniper,etc).Vertical gameplay is very important,it's not some marketing bullshit.
Game is very very detailed,it feels like people really lived there and quickly had to leave,there are tons of ordinary stuff in this game.
Crytek artists

Vehicle sections pretty much suck,except one(on rails,you control armored vehicle gun and rockets...

).Vehicle sections are very rare though.
As i said enemy AI tends to get stuck,my only technical complaint,but they move a lot and jump around(aliens).
They are very dangerous though,uncloak and prepare to suffer...you will be hit hard,from everywhere and they will come after you
Few seconds to live on higher difficulties...in order to survive you will have to move a lot,use suit powers and cover.
First person cover system works great.