Which system do you believe in? A system that has an elected official represent the nation, or an unelected figurehead to represent the nation?
Personally, I'm not a supporter Constitutional Monarchist. I like the fact that my head of state is non-partisan, but it drawbacks only enacts laws that are approved by the people (via Parliament in my country).
I feel having a Monarch creates less animosity towards the head of state. For example, about half of Americans approve of Obama, about half dislike him; simply on party lines. With a Constitutional Monarch, your animosity is directed towards the law makers, not the head of state; who's role is to represent the entire populace..