On some topics it can serve as a stand-alone basic source, but as you suggest, check it's sources and then use those to cite for the persons whom are testy about Wiki.
If you want basic information, say regards the nature and properties of the element nitrogen, Wiki is OK. But if going for topics tinged with political overlays and applications, like anthropogenic climate change(ACC) or anthropogenic global warming (AGW), than expect the left leaning bias and partial truths to run all through what you will find.
History and historical events tend to be more objective, especially the further back one goes, but still, check the sources used by Wiki.
Recent events, current political personalities, recent legislation and political activities will all need close examination and hesitancy to accept at literal value. Similar with many recent "news" stories. These all are where bias, mostly Left leaning creep in.
***** is that it's not just Wiki where this is a problem/challenge. Through out most MSM sources/sites and many first to second page lists one gets with websearching one will find many sites~sources that are far from objective, and the subjective most often leans Left.