Overall, I think its pretty impressive. The issue with a guy that size is repeating the delivery, which effects command. While you want the walks to come down a bit still over time, this is a solid place to start. He's K'ing more than a guy per inning, and has a 2.5/1 K/BB ratio.
If you take out the one horrible outing he had, his ERA drops a full run. Solid start IMO. Some work to be done, but definitely encouraging.