All news will inevitably show bias to one degree or another at some point, but that doesn't mean its totally unreliable and it doe snot mean it is biased all the time.
The important thing is how we consume the news, to be aware of the biases and to expose ourselves to different sources (which is admittedly getting harder as many news outlets are now just regurgitating the same news from a few key sources instead of doing their own reporting)
I highly recommend "The News: a User's manual", by Alain de Botton as a great guide to understanding the biases involved in reporting.