The 52 is helpless against Dynamos and has very tough time with rollers.
The dual squelcher is a roller killer. It has the ability to spread enough ink for mobility, range to splat rollers safely, and nimble enough to take out snipers.
I find the biggest problem in ranked is not enough ink on the ground. This makes it very difficult for a Blaster or Gal to survive. Unless I am in a squad where I can know our team composition, I tend to stick to weapons that effectively shoot ink: Splattershot, Splattershot Jr, Squelcher, Splooshamatic.
As for "not caring" about your rank, that is exactly the right idea. Your rank isn't something you achieve. It is a rough gauge of your skill and experience in a team environment used for matchmaking. Treat it as such and you will be more happy.