karrigan didn't immediately start winning trophies with mouz either. It was only a few months ago that dexter came to EU after playing in AU for a year or so and had to adapt to a new playstyle, a new team, a new role, new tactics, new calls etc. and not to mention that acoR is also a new player as well. Given the circumstances, they've done alright. Already won a tier 2 event and their only recent losses are to teams like G2 and NaVi who are both top 5 teams atm. Not to mention that these recent losses happened during their "hell week" where they were playing 30+ maps in 3 or so days. karrigan meanwhile can barely frag in FaZe with a 0.8-ish rating.
They only need to iron out some things here and there and they'll easily be a top 10 team. They're on a promising upward spiral, so it's way too early to discount them.