Wikipedia is pretty picky about what they have on theor entries. For some things, they're happy that anyone even put in an entry, but for more comonly known things, you have to be extremely elaborate in your explanation.
I think it really depends on who else is watching the entry at the time and what their attitude is regarding what a "good" article is. Some people in Wikipedia still holds to the notion (which frankly I think is a little delusional given the nature of Wikipedia) that it's trying to be a "real" encyclopedia, and so to them, articles should be informational and not trying to do everything like a fansite might.
From observations, current trend in Wikipedia tends to be wary of links to forums and blogs--many game forums tend to be either social (ie. mostly off-topic stuff) or Q&A (ie. help I can't solve this level), and blogs are often biased and opiniated. Thus in that line of thinking, neither are particularly "informational enough" to warrant a link from Wikipedia. No big loss really, given how dead this forum has been currently.
I do think that once covox's Lemmings wiki is in better shape, it'd be justified to add a link to it in Wikipedia.
