Most overrated- For me, it would have to be Sideswipe. I don't own him, but I have played with him. I love the Stingray mode, but the robot mode really isn't that impressive imo. It looks cool, and the arm blades are a great touch, but he just isn't as good as everyone says he is, imo. He is a good figure, but nothing I will be getting anytime soon. Most underrated- Demolisher. I chose to get him over the fallen. I think he is an awesome figure. The design is unique, and can get into some really cool poses, even with an arm on the ground. The vehicle mode is very nicely painted and detailed, and the shovel has some nice articulation. And I know it it isn't very impressive, but I thought it deserved a mention- it's very rare to see a figure with two different colors of transparent plastic.