How reliable is MSBNC?

First, let's define reliable. I expect a news source to report only the facts. Bias is okay, but any claims made must be truthful and in good faith.

So, my parents read a lot of MSBNC. I recently took a look at one of their articles to see how reliable they are, and something about it is rubbing me the wrong way. It's very obvious they're a liberal news source, but that's not a problem on its own. I would like to know if my worries are unfounded or if they're valid as I don't want my parents reading incorrect news.