ross being a taller meeks is pretty accurate actually... why ar we excited about that?
Ross is more athletic and bigger than Meeks. Fans can bust on Meeks all they want, but the team lacks a player that can move without the ball and shoot from deep. For whatever reason, Meeks was wildly inconsistent with his shooting this past season. If he had been good, he would have made a big difference on the team. So getting a bigger and more athletic version is a good idea.
Plus, while Meeks tries hard on defense, sometimes he is liability out there. With Ross' size and athleticism he should be a better defender than Meeks. Having three 6'6" guys (Turner, Iguodala and Ross) playing defense against the opponent's PG, SG and SF is a good thing. And it allows them to switch more instead of playing through pick and rolls which means less mismatches.