I always had a soft spot for the Ki-61, I enjoy flying it low on the deck while airfields are being horded, at such a high ENY picking off any decent aircraft is rewarding, many would easily ignore it as a threat. Our Ki-61 is a late war variant, its 20mm's are Ho-5 and pretty good, few dings and an aircraft goes down.
However, everytime I get stuck in an FSO event or Snapshot with the Ki-61, I usually hate myself. Given its usual opponents a P-47, P-38, Corsair, Hellcat - I usually get toasted. Spitfire V's as well, the only decent opponent I could easily combat were P-40s or P-39s.
Then again I am not kermit, he could swing that Ki around like it was a brewster and still shoot you down.
If I were to rejoin Aces, I'd fly a Ki-61 for the Perks. If you boom and zoom with it, it can be a nasty little surprise, just don't get caught slow.