Just fine IMO.
J7W was - finally - a Japanese fighter outfitted with a 2-stage engine. Meaning it will have far better chances in the fight against the P-51D, P-47, F4U, Spitfire VIII above 20000 ft than it was the case with the in-service Japanese fighters. Great firepower will make a short work of the enemy aircraft, and the 30mm cannons earmarked for it were of useful muzzle velocity so the chance to hit is not as low as it was the case with the German MK 108. It was also pretty small when compared with P-47 or F4U.
All in all, a well-rounded fighter, but too late, as it was the case with many Japanese aircraft.