They did some smashing, all right...!
If Captain Universe killing a couple Builders was the true turning point of the war, than that's pretty anti-climactic. All the loss and struggle and the planets working together didn't really mean anything, but this one god-like character on the team just washes the problem away? I thought Ex Nihilo leading a revolution of Gardeners would have made a lot more sense, one led by Captain Universe if need be.
Not to mention the fact that in New Avengers we learned that there are other Builders in the other universes, so basically defeating this batch only accounts for like 1% of them.