Even though I get tired of the repetitive nature of talk shows, my son-in-law has learned a lot from Sean Hannity and votes Republican.
In all seriouness, imo, it can seem repetitive because we generally know the news beforehand. But most of the audience listening to talk or nightly broadcasts does not.
For analysis I generally listen to Rush. Yeah, I know the news before he gets to it 8 out of ten times but I know of no one better that can break it all down, adding some insight I may not have thought of and keep my attention while not depressing the hell out of my spirit to keep up the fight. Hannity depending on the guest lineup. But when I was new to conservatism I listened to hannity far more often than I do now. And back then I wasn't reading the net throughout the day and they were lifelines.
I think most of these hosts are wonderful though, with some exceptions. They serve an important role as the net does and reach different people because their styles and format are different but Rush is the only one I'll listen to on a daily basis.
Laura, Hannity, Tony, Levin, occasionally Medved I'll listen when I have a moment or special events or guests.