I don't know why you bother wasting your time arguing with heel marks.
Are you seriously trying to use ESPN's power rankings as an argument? That doesn't come off as just desparate, but I think even weakens your argument.
You can't really tell if they're cooling off on Ziggler because of the points people have already made clear. Often MITB holders get a lot of losses before they cash in. I don't like it, but whatever.
As for Ziggler himself. He generates a lot of discussion in the IWC simply because there's so many who think he's amazing. There are also some that think he's terrible. I'd go more with in between. His clear marks hear one decent pop and think he's fucking better than the world. The problem is bias. They seem to forget it's really just a mediocre pop that's generated almost entirely by a group of themselves. These are the same people who chant "Albert," "Goldberg," "boring," etc. They also think he's amazing in the ring. They tend to forget that heels are booked to perform more moves in matches, while faces are booked to get beat up and overcome. It's the same premise behind the bulk of Cena's hate in the ring. These are also the same people who say Ryback can't wrestle, but Mark Henry is just playing a power wrestler...
Ziggler haters tend to overexaggerate how generic he is and completely discount his wrestling ability by only calling him athletic. They also generally bash on his mic skills and say he gets crickets when he comes out (this is only true when he dyed his hair. I swear you really could hear crickets. That's why it lasted only like 3 weeks).
The truth is he's in the middle of all the bullshit above. He gets some reaction when he comes out, but not a whole lot. His matches themselves get good reactions though because he's fun to watch in the ring. He's not very technical in his moveset, but his athleticism makes matches entertaining. His mic skills are below average but he's no John Morrison. The biggest problem is his voice. (He's no Bobby Lashley though
) He sounds like he's in the middle of puberty. If he talks slowly and methodically he's alright, but when he screams it's like someone grabbed his nuts. Plus his dialogue is generally corny, but part of that is on the writing team.
The best thing he has going for him is his ability to make a match fun. Too many people around here compare him to Shawn Michaels, which is hilarious, but they are comparable in one way. If you're good at making others look good (which most agree on both), you can stay relevant even if it means jobbing to the stars. SM is widely regarded as one of the greatest ever, but he only won the title twice.