I'm not turning this into a Shaw vs Smith debate (Smith is just a good, recent example of someone who skipped Triple-A entirely), but I'll entertain just this much:
Shaw - .212 BABIP, .298 xwOBA, 72% contact rate, 75.4% z-contact rate, 17.5% BB%, 22.8% K%
Smith - .333 BABIP, .216 xwOBA ,61.4$ contact rate, 67% z-contact rate, 7.1% BB%, 35.7 K%
Cam Smith has been awful. I'm rooting for him, but he's been a mess. He does have three hits in his last two games, so maybe he's turning a bit of a corner. I'll admit - I hadn't paid enough attention and missed his last game's line (the two hit affair). But Smith has spent most of the first two weeks looking exactly like he was a Double-A hitter who skipped a few levels. Matt Shaw, while the line hasn't always been great, has mostly held his own. Shaw looks like a rookie, Smith has looked over matched. The processes by which each have gone by their game is in stark contrast. Process matters. It's early, so obviously that can change.
I'll leave it at that. I truly believe one of these players needs some more time to marinate. If you disagree, you're welcome to that stand point.