My pet peeve is, that while IJN subs are allowed to operate ahistorically, allied air ASW has been "nerfed" to be mere "spectators". In my Scen 6 game against Japanese AI, my aircraft managed to sink whopping total of 4 IJN subs from Dec 41 to March 44.
In Atlantic, aircrafts netted about 50% of sunk subs and in Pacific there was still 18 IJN subs sunk by aircrafts when IJN subs were operating historically. So, I have basically come to conclusion that ASW mission is rather useless to aircrafts. I have had literally thousands of ops report "hits", but results are abysmal. Considering Ops losses to aircraft (especially when flying low for ASW, 1-2k ft), air ASW just doesn't do much compared to losses and effort.
I have had hundreds and hundreds of planes in PH and West Coast dedicated to ASW patrolling for over 3 years... I don't know how many ships were saved by "keeping the subs heads down", but considering ops losses and reduced range, there does not seem to be much point for ASW mission. Naval Search seems to be way to go, same as with WitP, where Air ASW mission was also quite useless, barring few special cases.
Which is why I am bit dissapointed, since I thought ASW mission would be bit more useful in AE.
"To meaningless French Idealism, Liberty, Fraternity and Equality...we answer with German Realism, Infantry, Cavalry and Artillery" -Prince von Bülov, 1870-