This is one of my pet peeves right there. Many classic protagonists are unlikable to downright evil. Frankenstein, Macbeth, Duddy Kravitz, Archie Bunker, Michael Corleone, Don Draper, Tony Soprano. Avoiding characters with protagonists you don't like embodies a lot of material. And Walter White was a monster long before we join him in the first episode as we see in flashbacks later on--the point of the series was to lure the viewer in to thinking he was meek and mild as we learn that he is really quite evil--which make the payoff in the finale all the more satisfying.