What armies are too reliant on Epic Heroes?

After seeing a meme someone posted about how people shouldn't use epic hero units (a sentiment I heavily disagree with), and seeing a bunch of comments how some armies just weren't very viable without them, it got me thinking. Now, I'm not one to care if a named character is viable or not, but I am curious as to which armies need their named characters.

Edit: I do want to add that I, myself am not against using epic heroes. I have a problem with them being must-have/auto-include units like they seem to have become.