He didn't just pitch OK or not that bad, he did great for a major league debut.
Discount his day if you really have to,(yes he was wearing a Boston Redsox uniform) but those who watched the game seem to think that he is the real deal. I know one thing, many people would give a right nut to have all their pitching staff do that well even against an off team as you post.
Sure, he may face harder lineups, but who is to say that he isn't going to get better as he settles in?

He looked like he pitched well, mixed up his pitches, his fast ball looked good and he also had some rather good offspeed stuff as well. He even handle some ground balls hit to him. I would give him a job well done, being his first time with all the attention and pressure everyone put on him.

but the old come back will still be, "Time will tell", but for now you have to give him his due, no doubt about it.

And we know you are praying for him to get rocked so you can
grin from ear to ear and say I told you so. But for now you have to wait. After all we have all be disappointed before on pitchers who were thought were the cats meow when they dressed in pinstripes.