Media

I think, generally speaking, Maddow makes a good effort to speak the truth on political topics.
And when she makes an error, she acknowledges it on air.

But as already noted, the show is on MSNBC (ie Comcast/NBCUniversal/GE), with funding from certain corporate sponsors that can flavor how information is presented - or whether it is presented at all. And they tend to focus primarily on the horse-race aspects of political issues during election seasons (which, given the nature of presidential elections these days, are most of the time), to the exclusion of other important issues.

And they are only on subscription-based cable which is not as widely available as some other news sources. (Especially compared to even Fox News.)