I, too, love Wikipedia. And I, too, spend hours wiki-walking. Wikipedia is a valid research tool when used properly.
It is necessary to be cautious, as there is some misinformation there. But you know what, that same word of caution applies to the entire internet. Any bloke can spit out misinformation on their own website or on any forum (including this one). But I find Wikipedia to be more reliable than the first page of google results.
I wouldn't call it a "one stop shop." For me, it's more like a good place to start. Often, the references will point to great sources of information. For example, I found a great resource on the history of the Soviet space program. Of course, when no references or citation is listed, extra caution is necessary. Not that every un-referenced bit of info is wrong, but it will need cross checking.
Whenever someone tells me "you can't trust Wikipedia," I respond with "I can't trust you, either." Or you can replace "you" with your favorite (or least favorite) modeling forum.