I love that I can start picking my hotties - not rating everyone - without logging in at all; that's very nice. And it's so much quicker to pick up to three hotties than rate and rate over and over again.
I do think there should be a "I'm interested in guys/girls" switch before rating, but other than that, I'm actually incredibly impressed. Whatever you think of the merits of the app, it's incredibly well-executed and well-designed. Everything works exactly the way I thought it would.