There's a much better Italian option in a nearby Germantown strip mall: Agrodolce.
It's in the same building as the Verizon store, between Bob Evans and Home Depot.
They do counter service at lunch and sit-down table service at dinner. I've only been there for lunch, and the food is excellent. Wide variety, but no one from our office has ever made a disappointing choice.
It's infinitely better than the Tagliatella in Clarendon (I haven't tried the Germantown one, and probably won't bother).