The news division of the Post is still more or less reputable. Their worst failings are by omission, what they choose not to cover.
It's much like the Wall Street Journal, which is a highly regarded source of information packaged with an editorial page that reads like 4chan.
Moreover, Bezos actively interferes with publications he dislikes. This isn't just an "investment company led by billionaires happens to own newspaper to extract profits" situation, the WP has become completely unreliable due to Bezos' meddling.