So there were five godlike beings sent to fight Sauron. Only one of them did his job.

I need to reword it.

You are the big cool powerful god. One of your servants, a minor much less powerful god does bad things to the world. So you send five your other servants just as powerful as the bad one to deal with him.

A lot of time passes. Three of those spend their time chilling. One joins the bad one. The last one turns out too weak. Who solves the problem? Four hobbits.

You really should reconsider your politics after that.