Brits:
Doctrine with sexton - as it is the most useless commander for them, the abilities sucks, so as the sexton, and it has valentine right? probably never seen it in use (maybe 0.0001% of games)
second choice is meh, dunno, none is perfect nor bad
OKW:
Feuersturm - for nothing that it has
Goliath doc - for the same reason as above, only stuka loiter is somewhat good but not special
USF
- M8 doc and with jeep
Ostheer -
hard to find useless doctrines because 75% of them are usless, only way to buff them is to change some abilities like:
-ambush camo - IMO it should be passive thing for infantry or at least reduce cost to 15 or 10
-hulldown - as it requires infantry on the tank to make it work, i think it should be toggle on/off ability
-tactical movement - like speed increase for 10 sec is that what we really want... so change it with some boosts like FMR or at least increase duration by a lot
-leigs barrage - because 120 muni cost for it is way too much for doing nothing at all with huge delay
-field officer - useless unit
-mortar HT - while this unit is somewhat good, it's still fuel expensive, and it's range is low
and after all i found the most useless commander - the encirclement
Soviets:
same thing as for ostheer
-guards and shocks could get some love with lower cost at least
-KV-8 is still OP as fuck
-while KV-2 is pretty shit and expensive
-but nothing beats the Urban def doc shittines