You're mostly right. But there's several bad epic medals. Pinocchio, Namine, Zack, Aladdin, and Alice at the very least are pretty bad. Do you really think any of the special attacks from those 5 medals are good? If you do though, fine. Agree to disagree. But I'm never going to use those medals.
Yeah their stats are pretty high but some of the lesser medals are pretty close to that. So in general, they're called "epic" medals really on because of their high guilt range. Nothing else about them is "epic". And currently it's near impossible to guilt them. So... the only thing that makes them epic is impossible to do. Therefore, in my opinion, they're not really worth it. A lesser medal that is guilted is always going to be far better than the "epic" medals.