The media IS the opposition party
President Trump claims traditional media represent a stronger, more effective opposition party than the Democrats. So far, he's undeniably correct.
This has only a little to do with the Democrats. They have no power in Congress, so no real oversight authority, and few high-profile voices since Hillary Clinton and Barack Obama exited the stage. Rarely do you see Democrats shaping the conversation about President Trump.
It has a lot to do with the media, which was unambiguously anti-Trump during and after the presidential campaign, but is now legitimately hammering away on administration scandals and missteps. A snarling press corps is turning ravenous.