Best Leader of the Soviet Union

[Pravda]

Lenin probably, simply because he got the whole thing started, led the revolution, and left what used to be a quagmire on good footing.  In terms of overall accomplishments, I'd say Stalin.  No other Soviet leader came close to matching the huge accomplishments of industrializing the formerly agricultural Soviet Union, defeating Nazi Germany practically single handedly, liberating Eastern Europe from the yoke of Western imperialism, and making the Soviet Union a world super power.

If subsequent leaders were more like him.

[Pravda]

Also, in regard to Gorbachev: 

I just don't see how anyone could consider him to be a good leader.  I can understand liking him for his distastrous policies which in the end destroyed the Soviet Union, but that simply doesn't make him a good leader.  His job was to LEAD, not to destroy the Soviet Union.  Let's say someone gets in a car and accidently runs over someone you hate.  Would you be glad he ran over the person?  Perhaps.  Would you call him a good driver?

No.  It would be patently absurd to do so.