I have flown this plane quiet a bit from time to time and my observations of it are:
Guns: Lethal, but very fast rof, you nead to be carefull or you will be out of ammo before you realise it, for most this gives the impreshion it has a small ammo load, when realy if used corectly their is enough for plenty of kills, balisticaly the guns fall between the Type 99's and the 50 cal, they are prety flat out to around 400 but drop bad beyond that range, shoting should be done close 300 or less imo, fire the cannons seperatly they are the killers not the 12.7mm. So in short the guns take a bit of getting used to, in order to be effective with.
Spead: It's slow, prety much all the Allied Pac fighters other than the P40, and the Wildcate are Faster than it is, the closeist of the faster ones the Hellcat can easly disengage and run if it wants.
Exceleration: unremarkable, its a bit of a slug.
Handeling: Poor by Japanese standards, Better than the F4U, and on a par with the Hellcat, dont dog fight a Wildcat.
In short it is a capable plane but it requires more atention than the other Japanese planes to be suxcessfull in, it is the worst handeling Japnese fighter, and it's gun package gives the impreshion that even the A6M5 has more ammo to use. The Zero's and the George do many things better. These traits make it the least disreable Japanese Fighter to fly in general.