I've only throwh a few discs that weren't from Innova so my least favorite will have to be an Innova. I hate to do it, but here we go. I got a Hydra, because it floats, to use at the Woodshed and Whipping Post in Paw Paw, WV. Apparently, not only does it have the ability to float... it has the desire to float. As a matter of fact, it loves to float. If I throw it, it's going to get wet! It may be my fault, but it's so overstable for an approach disc I find it virtually useless. It loves to take a header straight down.
And I bought a set of the "Frisbee" disc golf discs at a bargain store last year. I threw each one about twice and they went back in the box and back to the store. I hope they didn't sell too many because they'd probably turn new players away from the game.
As far as overrated, I'd have to say the FL. I got it as my first overstable disc, "to add distance to anyone's game." It ends up that it's definitely overstable, it just doesn't go very far. And I have a Champion Wraith that's way more overstable than the ratings. I just throw it instead because it's way more controllable and so the FL sits.
