Simmons was far more frustrating. He obviously has a ton of hand eye coordination, he rarely struck out.. but his swing was sooo bad that he either rolled over weakly or popped it up on the infield. He has the potential to be a .300 hitter. And my complete lack of faith in Kevin (let me completely change your swing) Sucker, I think he will one day realize that potential.
IMO, the biggest thing with Newcomb is the high strikeout rate, which is excellent. That at least shows that he's (1) staying around the plate enough and (2) his stuff is excellent. While his walks are high, they aren't any higher than some of the other big time arms. Some pitchers simply benefit from pitching in the big leagues where it's harder to lose focus in games, improved pitch framing (well, not with AJ, but you know what I mean), and better umpires.
Also keep in mind that with strikeout pitchers they are by definition not inducing as much contact early in the count, so they are going to have deeper counts with hitters. The last thing great pitchers learn is to maintain high strikeout rates while limiting pitch count and walks. Hopefully, Newk can learn that.