I learned in school that Wikipedia is the single worst website you could ever put on the bibliography because of how openly edited it is. However, in terms of MMA I agree that is is the MOST reliable website.
Yeah, it's a bad idea to use wikipedia as a source. Use it as a database (for which it is amazing and nothing else like it exists), and then drill down into the sources it cites, and use those
Even a textbook is only as good as it's sources.
But for MMA it's pretty safe. People don't often bother to make boring vandalizations, when they do they tend to be silly and obvious and get caught very quickly by editors.
Everybody good, plenty of slaves for my robot colony?