The really odd part about Gunbreaker gapcloser (for me at least, i don't main this class so take it with a grain of salt) may be the fact that it start to dash in such a "brutal" way in order to just full stop before the add/boss due to the fact that the gapcloser doesn't do damage, which makes the animation a bit weird.
But as i said i don't main the class, if the ability goes well with the class fantasy/gameplay of the gunbreaker fine by me, if not gunbreaker mains should talk about (it if they feel like it of course).