Face-Off: How Important is the Re-Watchability Factor?

So here's a question: Does a film have to be re-watchable to be considered great? There are those films that exist, those that were amazing to watch, but can only be watched once, perhaps do to their depressing, twisted nature or a specific twist that would render a second viewing "magic-less" as a result. So, how important is it to consider re-watchability when debating how good a film is?

After voting, you may discuss the poll here.

Big thanks to board user albstein for the idea!