I seem to recall that there was some impoliteness surrounding the Deep Blue game specifically- basically, it knew every move Kasparov had ever played, but Kasparov was not given any record of Deep Blue's plays to learn how it played (like he would have had against any other human chessplayer who moved up the chess ranks); that's the charitable interpretation of what Kasparov meant by the victory being fishy. (This hypothetical Kasparov would want to play many matches against Deep Rybka 3.0 before the official matches that determine which of them is better- but would probably anticipate losing at the end of his training anyway.)