There's a difference between going for points and trying to control areas, and there are specific weapons for both situations.
Jr. and Aerospray both cover a heck of a lot of area, and are versatile enough in combat. I don't think either of them is great in PVP, but they're both serviceable. They easily get a ton of points, though, just by covering huge areas in short timeframe. Honestly I think Jr. beats rollers in terms of shear surface coverage.
For controlling an area, I really think you need a better PVP weapon or 2 on your team. Splattershot Pro, .52 gal deco, one of the squelchers all come to mind. Those guns really seem unmatched for taking out other players.
I think it really all comes down to team balance. a team with a Jr./Aerospray or 2 (or throw a roller in here at times), 1/2 of the PVP weapons, and maybe a good sniper is incredible if each person fills their rolls... The PVP player(s) pushes ground and gets kills, the coverage player(s) control all the area that the PVP players have "claimed", and the sniper/other PVP player controls high areas and stops the other team from controlling their towers (a big weakness of the Jr. and Aerospray)