One of the things I love the most in uncharted 3 MP is the stealth arrow indicator. So good to genuinely know if you're in a stealth position to crack their neck.
Also, very cool to end a match by nutcracking an enemy with my foot n 2vs2vs2, lol.
And to be honest I find most of the complaints something normal, but also unfounded since people have played this for 1-3 and a half days at most. Sprint has saved my ass enough times to be relevant. It kind of helps too if you want to be stalthy and run up a player.
Constant speed means he runs away as much as you, so you never reach him and have to take him down with ranged weapons.
I really prefer having two modes of speed taht combined have an interesting approach for gameplay rather than a constant speed average.