Every one knew Olynyk could shoot. That's not what people were concerned about. It's that he won't be able to defend and rebound in NBA - he's soft. Soft bigs aren't effective - I find them rather annoying and, objectively, they're shopped around the league throughout their careers.
Pau gasol and Dirk would disagree
Pau's soft reputation is completely fake. He's been a great post player for a decade. He's skilled, but not soft. Good defense for a center too, and career 9.2 rebounds in 35.9 mpg. That's not soft. In fact his RPG is #10 of all active players; Dirk is #18 among qualified players. These are fake labels because they are skilled and european, so their styles aren't brutish, but they are not "soft."
We will see if olynyk is soft or just bad at rebounding, but his college rebounding projects him as nowhere near Pau or even Dirk.
I think Ryan Anderson might be an ok player comp, and Anderson averaged 6.4 rbg last year after getting 8.2 and 9.9 in college; the highest olynyk got was 7.3 in his 3rd college season.