It's easy for you guys to say this, you fly vultures, the ONLY platform that suits Pacifiers better than a regular gimballed large frag. Encouraging others to use fixed frags (normal especially) is to simply make the game more difficult for no reason. Gimballed frags allow you to hit and not be hit, as you can hit while flying off axis, very important for larger medium ships. Additionally, they are not really affected much by chaff, as you fire them within 600m anyway. The additional shot speed and tighter spread of Pacifiers is useful ONLY if you are faster and more maneuverable than your opponent (due to their fixed nature), which isn't always guaranteed even in a vulture.They are 100% worth it if you already like frags.
However, you might wanna get good with fixed frags as the Pacifiers only come in fixed.
Bottom line, yes, they're a good weapon, yes, they're fun to use, but the skill requirement to use them well is sky high, and even the best pilots would get better performance out of (for example) three large gimballed frags on a Krait, than 3 Pacifiers. That makes them a gameplay choice rather than something to recommend universally.