Just a rare, unbiased opinion. My handshake. Like you, I don’t understand people, who say “Yak-3 is OP”. Seems like all the whine 'bout “OP Yak-3s” is made by people who don’t understand air combat strategy and tactics.
Maybe they just fly to the “meet point” and dogfight then in chaotic style? It such a ‘mode’ it will be almost ANY aircraft that has balanced specs (climb/acceleration/turn/energy saving) that will annoy them.
Yaks are just quite popular, so they see that they’re often killed by Yaks… And instead of learning combat tactics and their plane’s advantages, choosing to complain about Yak-3s OPness…
Fully agree that P-51C-10 has its strong sides (600 kph+ in horizontal near the ground, perfect energy saving in flat climb/dive, etc) and not-too-bad turn time to attack Yaks when you have right position in a combat. And it has BR 3.7 (!) So Why “Yak-3s are OP” whiners aren’t whining “P-51C is OP”?
As you said, P-47D-28 is good against Yak-3s (and NOT only against em alone) too. Not to mention that D-28 is just a physics-law-breaker with its fantastic (for P47D) climb and turn speed. No Bf.109G-6 pilot can duel with D-28 in good hands in a turnfight. Rare G-2 pilot can… And, with its absolute high-alt advantage over Yak-3s (and almost all other Soviet planes), 840+ kph dive speed (against Yak-3’s 680), plus its “laser” M20 bullets… It’s just a killing-machine if you use it properly. And yes, it was VERY good @ 5.0 but Gaijins LOWERED its BR to 4.7.
So, I could say the same 'bout some Japan machines (A7M2, J2M2). Britts (Typhoon Mk. Ib), and so on.
And yes, 3U is much better than 3. It performs as well @ its BR, as P51C-10 or D-28 at theirs.
It is one of the most pleasant Soviet machines to play. But it meets Spit LF mk. IXs, Bf.109K-4s, P-51H’s (as you said) and jets… So isn’t an OP really, more just a good machine, if you know how to use it properly… But La-7 is like so!! NOT-a bad-thing that bangs out 5 enemies vs you alone, if you know what to do.
So, it seems like it’s the Pilot who rules?.. Thinking instead of [you_know_that_word]?