To paraphrase a favorite character of mine, "... I'm so sick of (article writers like this) I could vomit...".
Wikipedia has at its core one basic job to do: convey information. Setting aside for the moment the questions of validity of content, sources, spats between editors, astroturfing, etc, the prime question is, how quickly and easily was one able to find what one was looking for and absorb it. This is a task at which I personally feel Wikipedia does a fine job. It is a simple, straightforward visual style that doesn't bolt on any extraneous flash (no pun intended) or style just for flash or style's sake.
By the way, when the article author compares Wikipedia and Geocities visual style and finds similarities, I'm prompted to wonder where the author actually was when Geocities was in its heydey.
As for the complaint about the complexities of editing on Wikipedia: Heaven forbid that when editing one of the great repositories of human knowledge, that the editors should take the time required to learn the skills necessary to do so... seriously, if Wikipedia ever "redesigns" itself to appeal anywhere near the lowest common denominator of the Facebook/Twitter/Myspace generation, I quit.