Oh dear, not this again...
The VVS aircraft are good, but
not invincible. The ai can pretty much excel in everything so they don't count. Human players are a different story. A new player in an La-7 will not necessarily do well against an experience person flying a lesser aircraft, if you don't believe me try flying that -5 or -7 on a sever populated with experienced 109 drivers....not pretty
. On servers that don't use historical plane sets, you'll often see everybody in either an La-7 or a Spit 25lb because if you fly them long enough, you will be pretty much untouchable because irl those two aircraft were very, very good.
As a previous poster noted, if you are flying against the VVS, you'll generally do better above 4000m or using BnZ flying, don't forget, the VVS kites break up at relatively low speed compared to, say, an FW190 or Jug.
That said, if the friendly ai was better at team tactics and cover, it would be a lot more fun to fly offline against the VVS if they are set at anything above average.
Good hunting!