No, people look at Miz as a geek IRL, and in kayfabe, who is only a good talker. If WWE wants us to view him as a legit heel that can actually get shyt done once in awhile and deserves to be in this program with DB, he could have gotten the clean win. Add to that, the fallout segment where DB was questioning whether he still has it anymore, and it's a perfect storyline. There is no reason for him to feel down on himself in that segment otherwise, because Miz cheated, so there's nothing to be ashamed of.
We will see where they go on Smackdown but if it's a "DB is questioning his ability" angle, it would have been better as a clean win, and to take the chance to truly try to elevate Miz to DB's level in-ring wise. Sometimes a feud isn't always about waiting for the face to get a fair fight and win like he's supposed to, but "holy shyt the heel is actually damn good, I dunno if my hero can pull it off" then when he does, it feels like that much more of an achievement.