....Morison in "USN Operations WW2" stated the torpedo from Nautilus finished off one othe IJN carriers. Perhaps later and more accurate accounts than Morison's paint a different picture. ....
Japanese survivors off of the carrier emphatically state that the torpedo failed to explode.
Naval engagements that the USN was on the short end of the stick:
Savo Island ... a debacle of monumental proportions.
Cape Espearence .... on paper a narrow win, but tempered by a dismal employment of DD's and failure to capitalize on perfect tactical opportunities.
Naval Battle of Guadalcanal night #1 A mauling on the USN, due to poor planning, poor employment of DD's and the failure to capitalize on radar.
Naval Battle of Guadalcanal night #2 A clear win (finally)
Tassafaronga A debacle a monumental proportions.
Komodorski Islands A draw.
Kula Gulf A draw, although 3 cruisers and 4 DD's should have defeated the IJN force of 10 DD's.
Vela Gulf Finally a clear cut USN win.
Battle off Horaniu A draw, if it could be called that.
Battle of Vella Lavella A Loss
Battle of Empress Augusta Bay A clear cut USN victory, and they would not lose another one for the rest of the war.
I count one clear cut win after 20 months and two clear cut wins after 23 months. Not an impressive showing.
I am not counting Balikpapen as it was DD's versus merchant men, and the force only inflicted minor losses on the IJN when they had tactical surprise and gunnery supremecy, all at point blank range.
As for the sub forces ..... only one word can describe them ..."pathetic".