I don't understand the hate Boa 6+ gets on reddit. She is quite good.
Boa's 6+ definitely a lot better than her 6* version as a captain, but I don't know if that's saying much considering that Boa's regular captain ability is sort of broken as it stands... the RCV boost going away when you need it most is clearly an oversight design flaw with the original version.
Another issue, her special has completely different utility that feels... sloppy and ill-conceived for a 6*+ character. Her special just lacks synergy. Taken in pieces it sounds good on paper. You get all these different things for your QCK or QCK/PSY team, matching orbs, type boost, RCV orb, RCV boost... but it doesn't really come together in a cohesive way.
The meat orb generation is presumably there to heal you in order to give you more damage, but you don't get the extra captain damage on that burst turn. This means you basically need a healer on your Boa 6+ teams to deal with pre-emptives.
And it's really difficult to get a full board of matching orbs on a Boa 6+ team. It's so strange. Why couldn't they have made it so that the
opposite side gets all matching orbs? Currently, there's no viable unit that gives matching orbs to the team's right side to match Boa 6+'s left side orb manipulation. The best you can do is put Doflamingo/Lucci in there and a self-orb creator in one of the slots... and even then you don't have fully matching orbs. That's far from ideal, and ill thought out. Maybe they'll introduce characters in the future that will solve this problem. Currently, you can get full matching QCK orbs with a Lucci+ Doflamngo combo, but that renders Boa's orb manipulation redundant.
It's possible that we'll see her get some play as a mini-burst for QCK teams prior to a larger burst. But that will probably make her reliant on Marco again for multiple turns of orb boost, which is a personal disappointment to me. I wanted her to finally be free of the "Female Marco" meme once and for all.
Most importantly, I'm not quite sure that she's future proof. Boa's 6*+ basically makes her passable as a mid-tier legend now, as opposed to the bottom of the barrel. I feel like they could have gone the extra mile for her if they were going to take all the time and effort to completely revamp her. It looks as if they were worried about making her too powerful, but 2.75X captains are starting to be outclassed, and 1.75X special boosters are starting to be outclassed. They could have thrown her a bone.
Zeenigami compared her to Cavendish, but Cavendish's boosts are way way higher than Boa's during his 2X burst turns, Cavendish is a rainbow captain, and Cavendish has that unique property of removing team buffs, which is something that is totally specialized to him. Boa 6+, on the other hand, is restrained by the fact that she's a Type booster and not a Class booster, even if she boosts 2 Types that barely have any synergy. The whole QCK+PSY captain thing was never a good idea, and I feel like they should have just scrapped it entirely.
So, yeah. She's good, but she's also a hugely wasted opportunity and frankly a captain who currently doesn't have an "ideal" team setup. This is really only further reinforced with the fact that Whitebeard's 6+ is so strong, and Sabo's looks amazing as well.