There are a couple of reasons we might have recommended that Chilli's. Have any of your foursquare friends checked in there? That's a pretty strong signal for us, so that might be why it's showing up so highly. If not, it might be that a lot of people check in to that Chilli's.
That said, there's probably more we can do to detect chain restaurants and either boost them or bury them based on your personal likelihood of visiting chain restaurants. Unfortunately, all our ranking code currently works at the level of individual venues, so there's work for us yet on knowing that the venue is part of a chain and ranking accordingly.
I suspect your local Starbucks has two orders of magnitude more checkins that the local specialty coffee roaster/espresso bar…