If your opponent is buying DD’s with the USA it is unlikely you are playing 2nd edition. You should post on the correct forum to make sure you are receiving the best advice.
Bad Play = US goes into the Pacific
Bad Play = Germany overextends itself (Early Karelia attack)
Bad Play = Britain overextrends itself (ICs in both SA and India)
Bad Play = Russia not prepared for the Japaneese
Bad Play = Japan Not performing Pearl Harbor Turn 1