This guy is only 23 years old. The hard hit rate is something to monitor but he still has a lot of time to develop. I am very encouraged by the first 40 or so innings of his career.
His GB/FB rate is 1.50 (that would rank 20th out of qualified starters, he is only at 40 innings though) which will limit the damage caused by the hard hit balls. His hard hit rate and GB/FB will be something to keep track of as his career progresses.
I looked at rookie seasons for 22 to 24 year olds since 2008. His swinging strike rate (11.4 %) ranks 22nd out of 217 starters. Link
If you lower the innings requirement to 40 for this season, his SwStr % ranks 40th out of 158 starters. He is ahead of Greinke (11.1 %, 47th), Kluber (11.0 %, 51st), Kershaw (10.9 %, 52nd). He's behind Strasburg (11.6 %, 33rd), Nola (11.8 %, 31st), Berrios (11.5 %, 39th). Link