Yak3 is amongst the top in acceleration, climb rate, top speed, roll rate and its ability to absorb damage. Its small airframe makes it hard to land hits, especially with the stick-stirring warps exacerbated by the high roll rate and huge rudder. I won't even mention the 20mm cannons.
Sure, it doesn't carry much ammo and it's not great at high altitude, but neither of those factor in to its survivability. If there is any doubt, take note of the plane of choice for the most timid or survival-oriented players.
Perk the Yak3!