Should pizza be firm enough to be held by the crust? I've been to 4 restaurants already (with good reviews) and they all serve similar pizzas - they have to be eaten with fork and knife or else they will bend (because one simply can't hold them with a hand) and their contents will most likely fall off.Even cutting them with a knife completely disintegrates the pizza so in the end it turns into a weird salad of dough, tomato sauce, cheese etc.Is this what pizzas are really supposed to be like?
Speaking as an Italian, both Neapolitan-style pizza (thicker crust on the border) and rest-of-ITaly-style pizza will have a thin center that will normally bend when cut or held; the more so if there are lots of toppings. It shouldn't really disintegrate, that may be an indication of a bad knife, too.

Normally bending dough isn't a problem because you can fold the slice: