To use Wiki just by itself is a mistake.
In fact, using any reference just by itself is a mistake.
But Wiki is a good starting point. If you know little or nothing about a subject, you can get a nice overview at Wiki on which you can search more about it, either on the net, library, or wherever.
I also think there are safety features that prevent unscrupulous alterations to articles. If it's detected, admins can revert back to a previous article.
But don't quote me on that.
Either way, it's a good starting point for research, and can give you many clues on what the thing you are looking up do/who is/are used for, etc...