Here's another one of those unsubstantiated weapon X will rule the game posts...
but beacons are really amazing in ranked. Every second counts and what is important in ranked is to kill off, or at least guard, all the possible attack angles your enemies can come in. When you have a beacon deep in your territory, it's another angle of attack you have to defend or you have to go after it which can also trigger a comeback if you fail doing it.
Yup - I saw (and used) a lot of people using beacons on Saltspray for easy superjump access back to the upper levels or back area. Ranked really changes the use of a lot of weapons. Chargers feel a lot more useful and roller less so as covering a ton of ground isn't so key anymore.