That said, the former Soviet Republics that transitioned well are those that were smaller, already edging their way towards a market economy before the USSR collapse, and received substantial help from (and eventually joined) the EU (Baltics, Hungary, Poland, Czech Rep., Slovenia), and in the case of E.Germany, unification.
I don't think most of the others have fared that well. GDP/Capita is not a good measure because it doesn't take inequality into account.