Well, to me its honestly no big deal. Why? Well, most heels who were champions for a long time were strong heels who used cheap tricks sometimes, but mostly devastated their opponents (Yokozuna comes to mind, or Bob Backlund with the 'undefeatable' chicken wing crossface).
Now Punk on the other hand weaseled and cheated his way through the biggest part of his championship reign. I dont remember if he defeated anyone clean the last 5 to 6 months, he always had help or he cheated.
That makes him look weak. And that is how people will remember his title reign. The champ who survived day by day just with cheap tricks. And to me its not understandable. He is definitely a good wrestler (even tho also definitely not as good as all the Punk marks make him). He could produce heat without those things just with his promos.
As of now, he is just being build to finally be 'punished' for all his cheating, because thats wrestling business, the cheap guy always gets punished in the end.