While speed wasn't for everybody, the same could be said for stealth. If you didn't want to fight something, how is that a bad thing? You're the one losing out of hand to hand/blunt/blade/block so when it comes to face a super powerful guy later on, the battle will just get that much harder.
"Running was so unrealistic!!!!! It's stupid how can just avoid fights by running!" Well, how realistic is it to sit in front of an enemy, just for him to ignore you and when he walks away, you just crouch out of there?
Anyways, there we go. I don't see how it couldn't work out. If you don't want any speed bonuses, don't take any speed related bonuses.
It's just a shame because I was planning on getting this game for 360, but if it is literally just 100% same movement speed and sprint times forever and always(minus the armor you're wearing of course) then I may say screw it and get it for PC.