There was never any secret as to what the show was about; Mr Chips becomes Scarface.
Of course, we all bring our own expectations and hopes to any piece of fiction. If Jane Eyre was a modern TV series, I'd be really annoyed with the ending. I see it as a piece of feminist fiction, and I hate the ending. There's all kinds of novels that end 'badly'.
Great works of fiction are always reinterpreted, and I guess some people have reinterpreted Breaking Bad as it went along, and wanted it to end badly, but it's fairly normal for fiction to end with resolutions and catharsis.
That doesn't invalidate the criticisms of the final episode. Everything fell miraculously into place for Walt, the whole episode was about him, and perhaps the show copped out on an implicit understanding with the audience that Walt would get what he deserved. I didn't have a problem with any of these things, but everybody sees things differently.
I can't quite take in the idea that Dexter and Breaking Bad can even be compared, because I see Dexter as an initially amusing piece of fluff that jumped the shark when Rita died, and Breaking Bad as one of the greatest works of fiction ever created. Not just the writing and acting.
But you know, I don't think much of Mad Men, and various other shows that are supposed to be greats. We all like what we like. I've given the JLMB thumbs up to some real pieces of crap on this thread. I agree with ericthered about forbrydelson (sic) and Borgen now, (although I do think those shows turned out to be quite influential in some of their tones and elements, and have given rise to some of the best recent shows, like Broadchurch and that Gillian Anderson show set in Belfast). Under the Dome just became silly. I'm in no position to judge someone who thought that the final season of Dexter was good, although that won't stop me.