I'm with you. I don't even think that Episode VII should be the Skywalker's story. I think that Abrahms should set Episode VII about 1,000 years after ANH. Tell a whole new story. But that is just me.
That being said, I really don't have any interest in a Han Solo prequel. I don't think anyone can replicate the charm of Harrison Ford without coming off as a caricature of him. Plus, I think some mystique is some good thing. Mind you, Han and Chewie are my favorite characters in the franchise....but I like some mystery behind them. We don't need to see everything.
Plus, I think that it kind of undermines Han. There is nothing special about him prior to ANH. He is a scoundrel, a smuggler and a pirate. His journey into hero is what makes his arc in the OT poignant. I don't want to see a prequel undermine that.
As for Boba Fett, whatever. I've never seen anything special about him, to be honest.