I think the academic advice about Wikipedia was sadly mistaken. It's true that Wikipedia contains errors, but so do other sources. The problem was that it was a new thing and the idea that someone could vandalize a page startled people. It turns out, though, that Wikipedia has pretty good controls for this over a reasonable time-window. And there's a history of edits. And most pages are accurate and free from vandalism.
Just as you should not uncritically read any of your other sources, you shouldn't uncritically read Wikipedia as a source. But if you are going to uncritically read, Wikipedia's far from the worst thing to blindly trust.
I think it was. When I think of Wikipedia, I'm thinking about how it was in ~2005 (20 years ago) and it was a pretty solid encyclopedia then.
There were (and still are) some articles that are very thin. And some that have errors. Both of these things are true of non-wiki encyclopedias. When I've seen a poorly-written article, it's usually on a subject that a standard encyclopedia wouldn't even cover. So I feel like that was still a giant win for Wikipedia.