It is my PERCEPTION that P-47s are not at all hard to shoot down.
Here are what SEEM like the toughest plane to me.
#1. The Tempest/Typhoon. These are DEFINITELY at the top of my list. Except for their radiators, they just seem to absorb tons of damage.
#2. The F4F/FM2. This one makes a certain amount of sense.
#3. The Yaks
#4. The Hellcats.
#5. The Corsair.
Now, here are some of the odd points...the P-47 does not seem particularly hard to shoot down, nor particularly easy. The Corsair definitely seems to take abit more, which is just odd considering their relative sizes and construction. The 109s appear to be about as tough as the 190s, if not actually more so, which is just odd.
However, without access to specific data about the damage modeling, this is all just perception and speculation.