Cold pizza can be quite tasty. For me it depends (usually on the hunger). If I am hungry and I can afford to wait a few minutes, then I will stick leftover pizza in the toaster oven, and it tastes great heated up. But on the other hand, if I am hungry and I mean I need it NOW, then I will just eat it straight out of the box cold. Also depends on the brand. If it's one of those $5 pizzas from Little Caesars, then often I will eat it cold, but if it's pizza from Pizza Hut, then it tastes much better reheated.
You can never go wrong with pizza!