I've been here twice myself for lunch and have scheduled business dinners here on two other occasions.
The food is fantastic - I highly suggest any of the pasta dishes. They do a fantastic job of balancing their dishes to not make them too heavy. Keep in mind that their menu changes. I wouldn't say that it's "seasonal" because it doesn't work to cater to seasonal vegetables or anything of the same. However, they do take dishes off and put new ones on, so don't be surprised if you view an old menu somewhere online or if you return and the dish you loved the last time isn't there any more. (I promise you that you will find something else JUST as delicious!)
While this isn't really a beer sort of place and you'd most likely order wine with the dishes, if you ARE a beer drinker (you probably are if you're in Pittsburgh...) the beer selection is odd. Dogfishhead 60 min IPA, Hoegarten, and Peroni - that's it. I haven't tried the cocktails, so I can't speak to that.
Someone below mentioned the service as to why they gave such low stars. I've never been impressed with the service, but they're not horrible. I think it's just a little odd at the not top notch service for such a nice restaurant, but don't let that keep you from coming. Just keep it in mind where you do!