Save points
I get it as a relic from a past time where technology wasn't as advanced and it was easier to just have certain points at which you could save making the whole process easier on the programmers.
Nowadays there's no excuse to have save points at all and granted, i haven't encountered them as much lately but a game automatically got tuned down a few pegs if it had a save point system instead of letting me save whenever and whereever i wanted.
I get it as a relic from a past time where technology wasn't as advanced and it was easier to just have certain points at which you could save making the whole process easier on the programmers.
Nowadays there's no excuse to have save points at all and granted, i haven't encountered them as much lately but a game automatically got tuned down a few pegs if it had a save point system instead of letting me save whenever and whereever i wanted.
Story is a big piece of that game too, and it's story is spot on like a film, only more epic. Even the soundtrack is awesome! 

)
And that every little thief and every guard can climb the buildings as well as he can.