I know right? So let's try anyway :P
The background image looks pixelated on a big screen. What's worse though is that the face of the guy is always exactly behind the black thingy. Use a differently cropped photo, or offset it in some other way.
May I also suggest that a single, confused looking guy in front of a laptop isn't as great as, say, photos of two people on a date, preferable two people who actually like each other? For maximum bonus points let it be a couple that actually got together through your site :)
Also, personally I'd never sign up for something that doesn't have a detailed description of how it works, preferable including screenshots, up front. So I cannot say anything about what is beyond the signup page.
