Go read the patchnotes from UKF's release.
It's nerf after nerf after nerf because Relic always overpowers their new releases.
UKF in 1vs1 back then couldn't even reach the late game to unlock these late game tanks or abilities. Most games ended by the time 222 rolled out to mop up the brit players pathetic attempts to hold a fuel point having four men plinked by old wehr terminator sniper.
Nerfs were needed for late game cheese that Brits actually had a chance to unlock in team games with a teammate covering their glaring weaknesses.
So no they weren't op in ones like OKW or USF