Marriage brings a complete change of life, emotions, commitments and lifestyle that a single person knows nothing about.
Also, the pastoral ministry is also such that those who are not pastors cannot know what it entails, because they have never had to face the challenges, disappointments, heartbreaks, etc., nor had to conduct funerals of those who once worshipped God in his church, nor had to comfort bereaved family members. The pastoral ministry is more than just getting up on a Sunday morning and giving theological pearls of wisdom in a three-hymn-and-sermon church service!
Until you are married, and/or had experience in the pastoral ministry, you don't have the experience to make any credible comment about it.