The important numbers are the first two. "7" and "3".....those mean it's a total POS. The larger the last three numbers, the poorer the POS flies and the more runway you'll need in/out.
There's nothing BIG about a big 73. It may haul the same number of seats as the 752 but it'll never perform the same set of tasks. 73's suck! I can certainly understand why SWA keeps the fleet common, but there's nothing cool about a 73 no matter how much you stretch it....and it ain't a big airplane just cuz it uses the same amount of runway as an airplane weighing three times as much!
Depends on what you're comparing it to.