I know I'm a little late to the game with this one, but I just recently finished watching Breaking Bad. Completely overrated, IMO. Good show, no doubt, but one of the greatest ever? Hardly.
I don't even know if I'd rank it top 5 for shows with a corrupt protagonist. The Wire, Sons of Anarchy, The Shield were much better. (The Shield is completely underrated by the way), and then you have the other highly rated shows with a corrupt protagonist that I've yet to watch like Sopranos, Dexter, etc. Wasn't even the best show on AMC (Mad Men was better, have yet to watch Walking Dead but will probably jump into that next).
For Breaking Bad, I thought there were a few too many episodes that went nowhere and did nothing for me. Episodes like the one with the fly in the lab, when Walt and Jesse are stranded in the desert when the battery on the RV dies, when Jesse tries to get money from the addicts who robbed him and ends up babysitting their kid. Those stories seemed to take up the entire episode and didn't really advance the plot or develop the characters more, felt like nothing but filler to me.
Also not really a fan of the way the show handled flashbacks and flash-forwards. And the whole airplane angle seemed odd and unnecessary.
I give it 3 out of 5 stars.