The simple facts are plain as day. Roosevelt and Truman were compromised by Soviet Spies within their very own Cabinets. Therefore I consider them both as utter failures
When I was in school, EVERYONE considered Yalta a failure. Not even the leftist whack jobs were willing to stand up for the deal. They just said that Roosevelt was old and near death and Stalin got the better of him.
This wasn't that long ago, but it was when the Berlin Wall was still standing and it had to be explained why the Berlin Wall was there, and it got there because of Yalta. European capitals don't just naturally divide themselves into quadrants.
Considering how the left views EVERYTHING through the prism of Vietnam, you'd think they'd be mad as hell about Yalta as well. No Yalta, no Korean War. No Korean War, no VietNam war.
Like I said, they USED TO BE livid about Yalta. Now I guess they've traded EVERY principle they ever had to hate Bush. Bush says Yalta was bad, it must have really been good.
Harry "The Hop" Hopkins was the program's director at the time, and known now via the VENONA decrypts, to be Soviet agent "No. 19" ... also was FDR's alter ego.
And, of course, there is the theory that FDR provoked the Japanese (viz., frozen assets, worldwide oil embargo, ...) as the "back door" to entry into WWII ... to save Stalin.