I was destined to like the Yak.
On a personal note, I was a Russian Linguist in the Navy, and consequently, learned more about the Soviet Military, and VVS than I otherwise would have.
But more than that, the Yak-9U has decent Speed at Sea Level, as well as "good enough" maneuverability, across the speed band.
I think it matches up fairly well against most La-7s out there (though an experienced La-7 pilot will eat my lunch more often than not).
Plus, the weak guns on the 9U really help keep the population down. The converse of this, is the Yak-9T, which is simply a joy to fly. 1 Ping kills, ESPECIALLY when there's a second delay between the hit and the explosion, are one of my favorite things to see in game. I think the P-38 is the only Fighter I've seen survive an NS-37 hit. If you like the Ki-61, the Yak-9T has some similar traits. It's a bobsled (holds E well downhill, but climbs for ****), it handles well with a little speed, and it doesn't get away from you.
-Sik