There are, of course, better and worse ways to raise concerns. "Why did you do it this way? It seems to me that . . . " leaves the conversation open to the possibility that there is good reason for something you don't understand. And if there are major problems, it might be better to privately approach someone (and/or their supervisor?) rather than torching them in public.
But if there is a problem, you aren't doing anyone any favors by keeping quiet.