I wouldn't call BRS a big airport whether by number of airlines, air transport movements or passenger numbers, and certainly not by physical size. It's a small to medium size mainly short-haul regional airport. It certainly cannot be put in the same bracket as MAN or anywhere near.
I live near it and have been using it since the 1970s. It's very good at what it does which is largely short-haul with some TUI transatlantic charter routes and some long-haul hubs at AMS, BRU, DUB and the soon to be re-connected FRA.