Fighter planes too weak?

Ok, so I have unlocked all the planes, all 4 stages, have a pilot score which is in the top 2%. Wouldn't call myself a bad pilot but not a super ace either.

In general I enjoy flying and I think most planes are balanced....

Except for fighters. They are useless against armor, infantry, if you happen to have a rocket you might be able to defend yourself from AA. So it leaves you with the only logical (and thought out) option to engage other airplanes. You can intercept them, thats great...... buut you do so little damage against heavy aircraft it feels like a waste of time. Especially the Blenheim.

With the Blenheim I can use the spotting scope, help the whole team, gun down infantry AND any aircraft and can also carpet bomb them as a bonus. I love that plane. 30 kill streaks? Easy.

At this point fighters seem useless. And believe me I'm not a pilot who cannot aim and only chips away some health of enemy aircraft. You hit them for 5 seconds and they lose 1/2 health at best and obliterate you with the rear machineguns... laugh and repair.....

I can't even pick one fighter or gun which is weak. They all are. Except for the bomber's upgraded machine-guns which can RIP anything apart in 2 seconds.

Currently the only viable option to win air-to-air is either choosing the Mosqito which can 2 shot anything. Or the Stuka with  the upgraded front guns.