The USSR was terrible. Remarkably, the Nazis still managed to be substantially worse.
As one example there's the Hunger Plan. Hitler's defeat stopped him from executing it, though they had started. He planned to kill 35-41 million people in eastern europe via starvation and take the land for Germany.
The USSR equivalent, Holomodor, killed 3-5 million, and was fully executed. Horrendous. Not as bad as the hunger plan.
And that was not the only Nazi mass death plan....
That's a fair point. USSR soldiers did mass rape women in conquered territories (and even their own). And the Brits did have that famine in India that killed a lot as well.
Maybe the Nazis were worse, but wasn't really a good vs evil war.
Fair enough, but I'd say that half of Europe being free is better than none of Europe being free. I don't think there's much the UK could have done to help Eastern Europe.