Originally Posted by BillSeurer 
I'm normally pretty forgiving about such things but I find the save point system really irking. Also the stealth sections are totally fricking hard and if you fail at them you are stuck in a firefight with a gazillion guys. The lack of info on weapons and such is also bad; the throwing knives are totally deadly on a hit anywhere from 30 feet away (actually, any distance) but the silenced pistol can't take someone out with multiple shots in the back from 3 feet away. Huh?
I completely forgot about the save system. You're right though, it's pretty bad. No PC game should ever be limited to a single save slot.
The stealth sections aren't the only places with a high degree of difficulty. There are some areas later in the game that had me gritting my teeth as well. Just wait till you get to The Library.