I don't see how they compare.
Sure, there's the myopic focus, but that frames both their networks.
Beck was self-adulating, using forced tears to add a veneer of faux humility to his doofy cockiness.
Maddow's "Just like you folks, I..." approach barely conceals what teaters close to what haters might see as condescending arrogance, but her demeanor won't allow her to take herself or the subject at hand too seriously.
Glen acted like he might take it upon himself to save the world ("People ask me if I'd run for for President" ..... "We started the Civil Rights movement and we're taking it back").
Rachel knows it's all an absurd joke run amok.
The closest to Rachel Maddow on Fox would be the pre-The Five Greg Gutfeld, minus the snot picking humor. They're both snarky yet relatable, Maddow occupying a slightly more serious and formal plane.