Somehow I missed this thread until now.
The best answer for me is probably Bowie.
This is not to say that I don't like D. Bowie, I do, very much so. He's a fucking awesome dude. And I really enjoy Ziggy, and Hunky Dory, and a good number of other singles.
However, he hasn't completely "clicked" with me. And I'm not sure if he ever will. What I mean is, even though I love a bunch of stuff he's done, he's never become a real favorite of mine...someone I would list as one of my favorite artists. It's never gotten to the point where I become momentarily obsessed with his music and have the desire to go out and listen to and memorize every album.
I feel like that's one of the ways I determine whether or not an artist has really "clicked" with me - if I get that feeling where I want to play a certain album on repeat or go out and devour every tidbit of information and everything they've ever recorded. It's never gotten to that point with Bowie, even though I respect the shit out of him and will jam out to "Life On Mars?" until the day I die.