Who has ever said that the Guardian is devoid of an agenda? It's just that their agenda is toned down and doesn't scream at you and is better written. (Brainwashed?...please... save it for the sheep who buy into everything the tabloids and middlebrows spout) The Guardian, as has been pointed out, have been just as critical of NuLabour you will find...well any paper with an ounce of integrity would do the same!
But my point goes much further than the political stories it covers, I'm talking the quality in general of it's media, travel, sport sections, etc, etc.