I don't see being an "exceptional" playmaker as an absolute prerequisite to becoming a good top-6 NHL forward. I mean, it would really help his cause if he could add that to his skill set but it isn't absolutely necessary.
Virtanen is big (for a winger), blazing-fast, physical, a goal scorer, and isn't inept in the playmaking-department. Most importantly he has a good work ethic, and the fact that his playmaking is better this year is a testament to his willingness to improve his flaws.
I don't think he will be Cam Neely v2.0 either, but I do think he has the tools to be an effective top-6 forward. And, I guess, that's ultimately where we will have to agree to disagree.