Almost skipped the link, I thought it was some app for high school teachers or something since I mostly associate that with grades. Maybe some reference to the fact that its about restaurants may be a good idea.
I'll second this. Looks like an interesting app and a good use of public data. Not really obsessed with grading, though, so I'm not the target audience. My only quibble is that it doesn't really look "iOS native." Trying to set it apart from the crowd?