OK... ENY 10 because:
It takes exteremly much dammage before going down, I've taken 8x20mm hits from a Tempest 200 yards behind me then I flew home and landed (tempest was shot down by friends). The only dammage I had was engine oil. (granted the hits were most likely spread out but 8x20's i still 8x20's).
As all other P47's it's got 8x50 cal guns with up to 3400 rounds of ammunition. It can carry 2500 lbs bombs + rockets. This is not enough to get it down to ENY 10 though.
It is fast, pretty much nothing catches it above 20k and it's almost got the speed of a P51D at the deck. I, together with 3 squadmates were outrun by a P47N at 22k while flying 109 G10's, the G10 used to be the fastest plane up there but all the jug had to do was to put it in a very shallow dive and he left us in the dirt. NO plane in AH accelerates like a Jug in a Dive. Initial level speed acceleration is also supreme, even better than that of the Ki84 (which is a very small plane with a very large engine).
It's got the longest range of all planes in AH, you never need more then 50% fuel in it and 1 or 2 DT's. With 50% fuel it can turn GREAT like all P47's (the other ones can turn better with more fuel aswell), use combat flaps and it can stay with most things in a sustained turnfight. (part from those dedicated turners of course, spits, niki, ki84, zeke and so on).
It rolls very nice aswell.
It's got ENY 10 because, when flown right, it is one of those planes that can be nearly unbeatable.
The real question should be, why is the P47N unperked and the Ta 152 not? As both those planes are high alt versions/long range version of their former versions.