What makes Wikipedia unreliable is also what makes it useful, so they have to strike the balance somewhere. As you point out, it’s broadly rejected as source reference itself, so I don’t agree that Wikipedia is “controversial” as much as a known quantity.

The editing process is under constant review and is updated to address problems, while adhering to the design principles of the effort. It’s not as if they are ignoring the concerns you share. In fact, they hire people explicitly to think about and address these issues.

Gestures at 2016 Democratic Primary