I like sprint when the gameplay is boring and I need to head somewhere exciting
Otherwise, I think it's pretty bad, because it makes the game too easy to do, like getting kills, escaping, and it makes melee over powering. If they want to bring Halo back to it's roots, they shouldn't have sprint, or at least not make it OP, so you have to "shoot your way out", and makes the game harder and funner.