Average Speed of all pitches seen: 86.64 MPH
Average Release Point of all pitches: Vertically: 5.62 Horizontally: -1.02
Average Spin of all pitches: 197 degrees
5.61 vertically -.9 horizontally
So he is whiffing at more breaking balls on average, which isn't anything unusual. It also isn't unusual, considering he is a left-handed hitter, that the closer to the center of the rubber (or more lefties) is giving him more problems than average.
5.68 vertically, -1.17 horizontally
Still not the average velocity of all pitches, but he is making contact with pitches that are harder on average, with more spin on average, than the pitches he is whiffing at, suggesting he is doing better with fastballs than breaking balls, nothing unusual. The release point data also isn't surprising, he is doing better the further out right-handed the pitcher is, and maybe not as usual, pitchers that are releasing the ball higher.
Here are where pitchers have pitched McGuiness on average, along with his average swinging strike and average ball put in play:
Nothing unusual here, as he likes the ball a little more inside than he is normally pitched, and his swinging strikes are coming low, very low in this case. This shows us what the average spin and MPH of his whiffs (compared to all pitches seen) told us, he is having a lot of problems with breaking balls. However, something I found interesting was that his contact plays were still at a lower MPH than his average pitch seen. So here are all the pitches he has seen at 91 MPH and above, labelled with results, giving us an idea of how he is doing with velocity:
To me, it seems that the skills are there (he can handle big league fastballs well), and the approach is there as well. I think he can be a good big league hitter if given the chance, especially if he adjusts his problems with breaking balls so far.
* Thanks to Daren Willman of Baseball Savant, as I got the regular season data from his website, and he also got me the Spring Training data, which was just 4 pitches, but I included them into the post. I did not include Arizona Fall League data.