On paper, the dps is the highest, but in practice they're pretty much just dual cannons with a different graphic. As they have no Acc, CritD, or CrtH mods, you are better off with DHC or even DC with good mods.
Great for PvE, not so hot for PvP. Why? To prevent the inevitable run on a "pay-to-win" item. This was one of the few things that Cryptic did right. Not sayin' it was the *best* solution, but they haven't got a great track record with doing things that make a whole lot of sense either.
Yeah, i had the same issue. The damagae was only SLIGHTLY higher than MK XI even though i'm at VA. then add on the bonuses as well as the fact it's phaser only then it's just not worth the money. They should have just added the Sau Paulo as a costume/bridge set and integrated Quad cannons into the game as regular items. Sao Paulo can't even use the cloaking device....
This is one of those things were I was very excited to see it advertised (as the highest dps cannons in game) then once I learned the weapon stats themselves were mediocre I was no longer interested in buying the ship.
Pay-To-Win is an issue so I understand why quad cannons are mediocre. But at the same time Cryptic could start implementing items and powers so they behave differently in PvP. Giving PvE'ers fun toys that actually feel more powerful yet maintaining balance in PvP.
Besides, I think the whole Pay-To-Win argument is approaching a moot point now with the advent of Dilithium. Any player can buy a bunch of C-Points, Trade them for Dilithium and in turn buy all of the best weapons and ships in the game instantly.