In general, I do find the problem Lars mentioned: many Wikipedia
articles exist "in isolation" and are poor at discussing broader
context. I try and stop and think, "What is the reader likely to want
to know?" It's hard to think from the point of view of the reader,
rather than that of the writer, but trying is worthwhile.
I also try and send people I know to articles, and have them give me
feedback. Sometimes others can see what a contributor cannot.
-Matt