Wikipedia is a decent starting point if you're mildly curious about a topic and just want a general overview, but any reference librarian will tell you that it is not acceptable material for real research. This is due to the unreliable, and possibly untrustworthy, source of the information. Wikipedia can be edited by anyone and so might be biased, have errors, or even be completely (and intentionally) untrue.
A glaring example of this was discovered over the weekend when a reader happened to do a wikisearch for the title of one of my recent posts.
We'll need a little demonstration. Please play along.
1. Go to wikipedia's homepage.
2. Type "lan astaslem" in the search box.
3. Your first and second results will contain links. Click on either.
4. Now read the very first line.
See? If you search wikipedia for "I will never submit" in Arabic, it will send you to an untargeted redirect - the top of the page for "accept Islam and you will be saved."
I'm sure it's also a coincidence that just last year someone had to go in and edit out all the PBUHs.