Ridge workmanship on new roof

Kristin, a homeowner in Maine asked:

Came home from work yesterday, and this is what I saw for ridge workmanship. It's my first new roof as a first-time homeowner, but this does not look right to me. Roofer dismissed what I described as it not looking "clean" (especially towards left side) as related to cold weather. I'm not so certain? Hoping for some advice so I can speak up before the job is finished, thanks.