Everything we do has to be peer-reviewed, so the way I deal with it is to simply not approve anything that doesn't meet my standards, and help the person to understand why.
Unless you're the boss, I fundamentally disagree with the idea that you should have personal standards, that you force onto your colleagues to meet them like that.
In a business situation, the organization should have standards, and that's what they should meet. only if they've done something that is not fit for purpose, then yes, you can and should fail the review. But that's not you just not liking the way they've done it, you have to actually have a good reason to think it won't work.
The purpose of economic activity is to make money, not dot i;s and cross ts.