I use wiki for general purpose information.
I would not expect a left leaning organization to have anything good to say about those that may disagree with their world view.
As long as you understand there is a bias in Wiki world, it can be a useful resource.
There is a BIAS from every single source you choose to use. The key is not to find out if there is a bias (because the answer is yes for EVERY SOURCE). The key is to find out “WHAT” the bias is.