I am curious as to why many people like Antiproton weapons so much? I go shopping on the exchange and see pricing and availability, as well as seeing them used frequently in STO's. I wanted to have a ship for each weapon type in the game.
They have no apparent 2.5% chance of anything, and their overall look is far too dark red to be believable. Their damage is no better than any other beam array (or cannon).
They are also the only viable space Borg weapon in my opinion, as they are Mk XII and are effectively [Acc][CrtH][CrtD] monsters that have a 7.5% chance of hitting Borg harder. I love them for my playstyle, love the sound they make when they fire, and with the changes to stf drops, weapons of that caliber are almost impossible to find (or fetch a crazy price only rivaled by something with more Acc mods).
Critical severity has a 20% bonus, and most people only want to be kirks and damage dealers in the game. Extremely overpriced, imo.
Most people just use their brains and don't want to rely on a lottery to get a (for PvE) useless proc once every three fights.
Not to mention the CritD bonus basically makes them scaling. The more crit chance you have, the more you'll get out of that inherent severity bonus. I wouldn't use them on a cruiser or a sci ship, but on a tac escort, they are simply the hardest hitting weapons by a huge margin. Or at least they were when you could still reasonably obtain them. If you still have a STF set from before S7, you are a lucky person. Right now I wouldn't equip a new ship with AP, purely because the only available ones are from the fleet store with crap modifiers or crafted MK XI stuff. But once Cryptic makes them available again, say goodbye to all those plasma builds that are so popular right now.
I use Antiproton cannons with the [Borg] modifier and I get crits on 7/10 shots I make. They really are the best damage dealing weapons in the game, but as someone else mentioned, their proc doesn't help the team at all (besides shredding hulls).
I prefer CrtH over CrtD, and antiproton weapons don't come in CrtHx3. With my crit severity boosted so much from borg and tachyokinetic consoles and Romulan boffs, CrtH is better for me since my base severity is over 75% already. So I use all Disruptor [CrtH]x3 weapons, works much better for me then AP.