This is another one of those places that I am sure I am missing out on because I don't drink. From what I hear, the beers brewed at Cornerstone are really good and definitely worth checking out, but I can't speak to that from personal experience.
As to the rest of what Cornerstone has to offer, I can say that it's not a bad place to go. The food tends to be of the bar food variety - burgers, sandwiches, pizzas, etc. Whenever I've eaten there I've been happy with my meal, even if nothing stands out as spectacular. I take that back, the fries are actually very good - they're seasoned and very crispy. The atmosphere is a little loud - lots of reflective surfaces have that effect, but it's also spacious and clean, which is nice.
The service has been reliably good, and while the prices might be a little steep for a lunch, they are very reasonable for a dinner. If you're in the neighborhood, it's worth checking out.