I disagree - mediocre pilots rarely realize how to take any aircraft to anywhere near it's full potential, so they essentially figure out which aircraft are easiest for a mediocre pilot to get the most out of. This is a very different thing.
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If you could give some examples of aircraft that are overlooked, it would be a good place to start. If I were taking your side of the argument, (we already have the 152 and 47N) I would add the 109K-4 and Yak-9U as aircraft that potentially dominate the arena but require a skilled pilot.
Now, to take my own side again, I have to give reasons for why even in the hands of a skilled pilot, these aircraft fall short of dominance, and most of all when matched up against the traditional "best aircraft," e.g. Spit16, La-7, P-51D, N1K. These are the 4 most popular aircraft, and I have said that likely makes them the best arena aircraft.
First, I will grant that all of these popular aircraft are easier to fly than the non-traditional candidates listed above. Still, it is easy to tell when a great pilot is in a Spit16 vs. a point-and-shoot turn-in-the-horizontal type.
Second, any comparisons for "best arena aircraft" should assume altitudes below 20k ft.
The easiest one to discount as "best arena aircraft" is the 109K-4 because of its heavy controls in a dive. It may be the only major weakness it has, but it's a huge limitation nonetheless.
The 152 has good performance and firepower, but below 20k feet it is not superlative. Many aircraft run it down, or out-turn it, or out-roll it, or out-accelerate it. Still, it performs well enough in these areas to be very competitive, but success in it requires strong SA, which is
universal to all aircraft and not a kind of knowledge or know-how about that aircraft in particular. Unlike the 109K-4 with its monster acceleration and high-speed, the 152 does not have an ace-in-the-hole to get out a jam.
The Yak-9U is limited by its ammunition clip and short range. Good pilots will get in close and some can squeeze 6-7 kills out of it (I can't), but those same pilots could get twice as many kills if the Yak-9U had the firepower and ammunition clip of its cousin the La-7.
Lastly, 47N might be the best of all these 2nd tier aircraft. I've seen some great pilots who can knife-fight in the vertical with the best of them in the 47N. It has great range, great firepower, great low speed handling for making those high-aoa shots when the bandit least expects it. What the 47N lacks, and this was pointed out above, is a good amount of WEP. Without WEP, the 47N is actually slower than its D model brothers, and tops out at a paltry 328mph at sea level. Perhaps it would be fair to say that the 47N can be the best arena aircraft for 5 minutes.
Well, that's my case. For every aircraft here I have pointed to specific weaknesses that a great pilot cannot overcome, and so they cannot be the best arena aircraft. I probably didn't convince anyone, but it's always worth trying.