User blog comment:Tsubakura/Mythbusting the metas of KanColle/@comment-62.77.119.80-20170223105959/@comment-108.88.197.98-20170226211919

There is one thing I like about the OTOs. Two secondary guns plus a torpedo still does nighttime double attack. 2xOTO*9 + Quint*9 gives a light cruiser +37 night battle damage while retaining the double attack. Triple OTO*9 gives +33 FP for better daytime armor piercing and still maintains night double attack.

The best standard setup, twin 20.3(#3)*9, gives you 26 FP, so the OTOs offer actually a significant upgrade in raw damage if you find that style useful.

I do agree that overall they are pretty niche, though. Now that I have enough 20.3(#3)s, my OTOs are mostly seeing use helping auxillary ships contribute during PVP leveling.