The university cafe next to the building I work in is dire. Cold, undercooked burgers or reheated chinese food prepared elsewhere. Best you can say about them is that the chips are fine. Don't even want to think about the breakfasts.
It used to be okay 2 or 3 years back as well. They'd do little pizzas which were really nice, and perfectly decent yorkshire puddings full of beef and veg, but that's all gone now.
With regards to actual school lunches, I've never eaten one. My primary school was around the corner from my grandparents' house, so I went home for dinner, and in comprehensive I'd go to the local shops. Either a steak bake and a doughnut from Greggs, or a cone of chips and a bacon sandwich from Dicksons, then on to the paper shop for a drink and a chocolate bar.