Lot's of Wikipedia articles are reliable sources. That is a judgement call which CZ authors are qualified to handle.
Are you serious?
Well, yes, I'm going with Richard on this one.
I have said this from the beginning, there are some well-written, well-researched WP articles out there, and other articles which, if not being perfect in total, nevertheless contain valuable and accurate information therein.
In these of which I speak, the sources and citations used are the same ones we would rely on here. If I understand Richard's point, our experts would know just by reading...or skimming...which of these are valid.
The problem I've found with WP articles is that they can deteriorate so fast, and that vandalism, subtle and glaringly obvious, ruins them and can sit undetected in estoteric articles, and that popular articles get negotiated into mediocrity, and that controversial articles are...well, you know.
Also, policy is all over the place, enforcement is capricious, standards are capricious, just about everything is valid, including that which I find foul, and so forth.
That's why *I'm* here; not speaking for anyone else.
Those are some real problems, and I've found them insupportable.
That does not negate all the good content.
You want a list of WP articles I found really interesting, really well-written and really good? Call me.