When the Colts' offense is great, it is all about Manning being the greatest QB since the invention of the forward pass.
When the Colts' offense is held to 17 points and gives up a pick 6, it is all about how Manning did the best he could and those around him really needed to step up.
Sorry, but you cannot have it both ways. Manning called a piss poor game after the first quarter. He abandoned the run in the second half and gave the game away with his pick 6. If you want to call him the OC on the field, he is to blame for their offense looking like shit.
As for the greatest of all time, Manning is arguably the best regular season QB of all time. Sadly, you don't face the Cleveland's and Oakland's of the league when you hit the post-season. He cannot even hold the job of Montana in terms of greatest of all time, though.