Different eras and all of that, but like you said, The Shrinkers were believable. They were also intimidating and looked like they could kick ass. The Usos, on the other hand, seem like they could be swallowed up whole by a gust of wind. Sure, there's a size difference, but that isn't what I mean. I think it's more down to their demeanor. Like you said, The Usos get too cute - not only with their moves but also IMO with their promos and mannerisms. I realize forced catchphrases are an unfortunate fact of life in WWE, but The Usos are particularly bad in this area.
Having Braun win the title at WM would've at least felt slightly special, but I'm guessing the reason it happened now because Sami can't take a Saudi vacation. (Lucky him!)