I recently ate at Sinatra with some folks and had quite an enjoyable time.
After waiting about 15 minutes or so for their table, we were seated in their beautiful dining room at one of their large round tables. People weren't particularly hungry, so we did not over do it by ordering starters and sides.
I started with an excellent caesar's salad. There wasn't anything unusual about this dish, but that's the way it should be when you order a caesar's salad. For my main, I went with their Osso bucco. Again, it seemed like a pretty standard preparation of this dish, but it was expertly done.
All in all, my experience was very good here. There was nothing inventive or provocative going on here, so if you want classic Italian dishes well executed, Sinatra is the place. I would expect nothing less from a place with such a name.