I'm not familiar with Cornerstone. If it's a fairly upscale place then I'd probably believe it does. However, we do have Burgerville, which is pretty good. It's basically the Northwest's response to In-and-Out.
The real trick is whether or not you have money to spend. El Gauchos - downtown at the Benson Hotel - is amazing, but it's really high priced. So are most of the really good restaurants in the Pearl - such as Paragon and that Peruvian place that I can't remember the name of. There are several Gustav's around town. Really good German food that's not too expensive. Plus, they have fondue. Old Chicago, Applebee's, and Red Robin are kind of the staple cheap, but nice sit down places. Oh! And there's also the Montage - under the Burnside Bridge. They have really good cheesecake.
Aside from that, there's a whole bunch of various cafés and restaurants scattered all over the place. You can't go two blocks without finding a coffee shop of some sort.