Hopkins has decent size, nice speed, and superior production but he has the droppsies which has him rated around the 10th best TE in this draft.
Here's what nfl.com's Lance Zierleinsays:
Overview
Flex tight end with enough route acumen and separation quickness to open throwing windows, but modest ball skills and below-average hands can turn potential completions into drops. Hopkins' issue with catch consistency has been ongoing and is unlikely to change as a pro. While the athletic talent looks good in space, there was a noticeable drop in production and opportunities when matched against man-cover talent. Hopkins could be viewed as a one-dimensional slot tight end with Day 3 draft potential, but his issues as a pass-catcher could limit his long-term prospects.
He still caught 61 balls last year at 13.6 y/c but if this report is valid he might be there in rounds 4 or 5.