It has pizzas that are reminiscent of the ones served at Via Napolia (i.e., wood-fired thin-crusted). I enjoyed the pizza (some are better than others), but it wasn't anything outstanding. The calamari was pretty good (but most places can do calamari fairly well). The other entrees were hit-or-miss (mostly miss, so I'd say stick with the pizza).
VN is on my family's "must do" list for WDW, but we didn't find Naples to be worth the long waits to be seated. For me, the biggest disappointment were the desserts. The Coppa Di Brutti Ma Buoni sundae is one of my favorite desserts at VN, so I was excited to see it on the Naples menu. It turned out to be far smaller and was lacking.
Overall, I would say that if you like Naples, you'll probably like VN, but the reverse may not be true. If you go to Naples expecting VN level quality, you'll be disappointed.
This is the Coppa Di Brutti Ma Buoni sundae at Naples:
This is the version at Via Napoli: