Isila, I would say so. My DS is 15 and my DD is 12 and 1 pizza, a portion of chips and a side would have been fine between them. They would have insisted on a dessert each though!
The pizza was of the stonebaked, quite flat type, but very tasty.
Another place we share meals at is Fuente Del Oro at lunchtime. We buy a mix and match of Menu 1 - (chilli con carne, nachos & drink), Menu 2 - (Chicken Enchilada, Cheddar cheese sauce, Mexican rice, Chuurros & drink) and Menu 3 - Chicken Fajitas, Mexican rice, a Magnum ice cream and a drink). With Dream AP discount it comes to just over 33 euros for lunch for four. My son and DH can really eat too! That is just over 8 euros each!
We do similar at Hakuna Matata too. Toad Hall is another goodie as well as Pizzeria Bella Notte. I figure if that is enough for what is effectively 4 adults, then if your kids are younger, they will be fine.