Yes, for the most part. They've had problems in the past with people updating their own page or something politically sensitive with slanted info or outright lies. They've taken steps to prevent this, but even so, 99.9% of their content is not personally or politically sensitive.
If you're doing a research paper for school, Wikipedia is like the old print encyclopedia, not the ultimate info source but a place to begin. If you really want to know about something in depth, Wikipedia will get you started with good basic info, and a list of references to chase to get more info if you want it. We didn't have Wikipedia when I was in school, but I'm surprised to see that many teachers won't allow students to use Wikipedia as a reference. I think this is because they don't want kids just looking up the Wikipedia article and paraphrasing it and there's their report. They want students to learn to use reference materials, to look stuff up, to have many sources. That doesn't mean they can't USE Wikipedia, only that they can't just stop there.