Honestly, it's one of the best resources I've seen since Planet Megaman died awhile back. Why, therefore, does everyone hate it with a passion comparable to those who hate Twilight?
I don't hate MMKB. However, I do see areas that need improvement. The few times I've gone there, I corrected grammar and spelling. Poor sentence structure runs rampant there. Some articles also lack links to relevant related articles. There is also fanon, according to others, and most articles that I've seen lack citations. The categorization seems a bit lax, and the article format could be much better. The usage of present tense in articles is also a bit informal. The prose is also chock full of POV. I mean, just because one user thinks that Blaze Heatnix is "extremely difficult" doesn't mean everyone else will.
But, as was said in the other topic, to which I am going to merge this afterward, not every wiki can be Wookieepedia.
Though, taking a page or two from our Manual of Style certainly would help. It just takes people who are willing to put in the hard work to make sure that everything is sourced, spelled properly, and is free of fanon. Sadly, it seems that the MMKB just isn't willing to do that.