Not really. There's no particular policy basis for objecting to biased sources, so this only comes up when - An occasional newcomer tries to raise concerns, be

Not really. There's no particular policy basis for objecting to biased sources, so this only comes up when - An occasional newcomer tries to raise concerns, before being informed that it's pointless because Al Jazeera has been deemed reliable. - Occasionally other reliable sources contradict Al Jazeera. Both are quite rare compared to the vast number of Al Jazeera references.