The Rapid Blaster is definitely not as bad as many people think. I've been playing all blasters a lot lately, and I figured that tonight was the time to try some Rapid Blaster Deco; because while I've played a little bit of the regular Rapid Blaster, the Deco had been left at probably <2000 points. And wow, it was an interesting and rewarding experience.
The Rapid Blaster (Deco) has weaknesses, yes, but come on, any weapon has weaknesses. More importantly, any weapon has strengths, and to make a weapon work, you focus your play around utilizing your strengths and protecting your weaknesses. The Rapid Blaster Deco is vulnerably in close combat, yes, but that just means you adjust your play style to make up for it. The suction bombs are great for zoning and should be used a lot, and a very simple way to keep your close quarters safe is to just keep an area of your own turf between yourself and your blasts, because that means enemies have to colour it before they can approach you. Sometimes they don't, and try to attack you anyway. Guess what? That means they took damage from the ink on the ground, and can now be killed by a single blast, provided you have damage up gear(and they don't stack def). And if you're not confident that you can stop an approaching enemy, you can easily take cover and jump away, which you should do in order to protect your special meter. Doing this can be very satisfying, seriously, one time a kraken was chasing me, so I juked him, and as he was turning around to get me, I super jumped away.
I've been playing a lot of Range Blaster lately, and I've felt like it's been great practice for playing at your max range and being defensive. I played Rapid Blaster Deco tonight because I thought it would be even better practice at that, but it was so much more. Basically, the weapon makes you better at zoning with bombs, using your range, playing defensively, being patient and being aware of what's going on. I knew the Rapid Blasters could work, but I did not expect to pick up a weapon I more or less haven't used before, play 3+ hours of solo ranked(at S) and manage a 10,0 vibe and have positive stats every single game(I think 7-1 and 10-2 were the best). It really isn't a bad weapon.
That being said, there are certainly game mode and map combinations I probably wouldn't use a Rapid Blaster for. Just like with other weapons. Although I will try, in time.
As for the topic, I can't cast a vote, because I really do enjoy all the blasters too much to call one a favourite. :)
Which one I play is determined by a lot of factors for every individual situation. Which mode it is, which map it is, what role and range does the team need if I'm squadding, what mood am I in? I simply love variation, so I'm very glad that I've practiced all the blasters, because they can offer such a big array of play styles(especially if you have multiple gear setups for different goals).
I will say though, that I'll pick Custom Blaster over Blaster for most situations. And I'm not so sure about the regular Rapid Blaster, because Luna Blaster is a better blaster with Ink Mine, Custom Blaster is a better blaster with Bubbler and Rapid Blaster Deco is a better rapid blaster. But if you really like the weapon+sub+special combination, good for you!
I know this post is already ridiculously long, but side note: Considering that the recent updates have been new weapons instead of Custom/Deco variations, and that we've seen a new Splatling and Slosher relatively recently, I'd say we might get Rapid Blaster Pro very soon. I'm hoping to see it this Friday night. :)