Opinions of Correa's defense seem to vary a lot from pundit to pundit.
I think it's pretty simple:
Propeller-heads who think everything in the world can be statistically quantified have no qualms about judging the defensive ability of a player they rarely watch. This is because they can simply refer to the defensive metrics, and the defensive metrics tell them that George Springer is a pretty good right fielder, Colby Rasmus is an average-at-best left fielder, and Carlos Correa's defense is a hindrance to the Astros winning.
People who actually watch the Astros know that Springer is a gold-glove quality right fielder, Rasmus is an excellent left fielder, and Correa is an inconsistent, but generally good and occasionally spectacular shortstop.