I've been there several times.  Last time I had a Cesar Salad and soup (I felt really, really horrible; I went back to the room afterward and was running a fever). That was mediocre at best (of course, I was sick). I've had their pizza before, different ones, and wasn't impressed.  I can get better pizza two minutes from where I live for a whole lot cheaper (as in a big slice for $2 a piece).
It's not that it's bad, just extremely overrated IMO.  It's actually funny because I'm a college student, so pizza is its own food group, and I don't really like Via Nappoli.  I just find it overpriced and don't understand why people rave about it.  Over $20 for a personal pizza?  Don't think so.  Much as I love pizza, I don't go to WDW to eat pizza.  Especially not in Epcot.