I'd vouch for them, they've been around for a really long time and while I don't subscribe to their politics I've never come across blatant lies or propaganda* in >10 years of occasional reading, which is more than I can say for a lot of agenda-driven news sites.

By propaganda I mean stories whose only purpose is engender attitudinal change, eg gleefully reporting on sex scandals but only if they happen to your political enemies. Obviously they have a pretty orthodox Marxist/communist agenda but since they're completely open about that I don't consider it manipulative of their readership.