Yes. McClellan's performance was as terrible in politics as it had been in the millitary. His appeasement of the CSA was just as timid as his reluctance to advance on the battlefields. Speaking economicly, the South would have faced defeat within a few years more of total war anyway had McClellan not ended it how he did. He's lucky he got assasinated before he further stained history with his precence.
As it was, his legacy of indecision leads to the twin Americas, and thus most of the (luckily non-millitary) conflicts between the two over the fate of the rest of the west (the California Debacle comes to mind, as do the continually embarassing Westward Border negotiations). Frankly, I think the CSA's precence always hobbled the US internationally, even as much of a rump state as Dixie eventually became.