Well -- let's talk about what's bad for COLLEGE-LEVEL RESEARCH.
Wikipedia articles just don't look good on your list of Works Cited for a college paper. In fact, many professors at Valencia will not allow students to use Wikipedia at all. That's because:
(1) You never really know where the information is coming from. Is the author an expert on the subject? How do they know this information, and are they the best person to ask? It's usually impossible to know or verify.
(2) Even if you're certain the information is good today, you can't be sure it will be the same when your professor, or someone else, goes back to look at the article later.
Stephen Colbert demonstrates the perils and folly of relying on Wikipedia
Wikipedia can be useful for two things: key words and the references.
Wikipedia is a great way to get a feel for a topic you know very little about. Type in virtually anything and you get a lengthy article explaining it in usually very uncomplicated terms. Keep a piece of paper nearby and make a list of all the words you find that might make good search terms later. Use them when searching the library databases for more scholarly sources to cite.
Wikipedia is not itself a source you should cite, but usually it contains links to some very good web sites! Look near the bottom of a Wikipedia article at the References, Further Reading or External Links sections. You still need to evaluate these for yourself, as you do not know exactly who is recommending them, but often they are a very good starting point for your web search.