Oregano's runs hot and cold in my book. I've had great meals here (pizza, mostly), but I've also had a fair share of bland pastas and not-so-spectacular sandwiches.
I keep coming back, however, because it's a fun, friendly place. I'm a big fan of their quirky shirts (today's read "legalize marinara"), and the servers are always smiling as they go about their business. Most everyone goes out of the way to make sure you're having a good experience (today, for instance, I was promised a donation of dozens of empty cans for the school at which I work).
I'll be back, and I'm hoping to try the deep dish pizza soon.