It changes type of weapon guidance for all aircraft weapons. It is mostly useless unless you want to nulify bad weather penalties. You don’t need to have priest on the ship and Will has nothing to do with that. There will be no additional chance for hitting enemy ships.
It makes additional damage to faction ships. Useless against Pandorans.
It prevents enemy weapon from functioning. Effect is higher when targeted weapon module is already damaged with normal damage. Can be handy if enemy has some powerful and durable weapon which you can’t counter.
Just another type of weapon. Can be devastating if you will hit and if you will be able to prolong fight long enough. In my opinion not really interesting. You don’t need Mutog.