I think sprint itself is not a problem. The velocity you gain thru this ability is the actual problem. If sprint would be just slightly faster than your basemovement-speed, its effect on escaping and not getting punished adequately wouldn´t be gamebreaking. Actually sprint in this scenario would require a lot of overall game awareness (like where are the enemies and which angles are your enemies and mates holding), due to its low reward/risk relation. That would be a good thing in my opinion.
P.S.: English is my second language.