There's a lot of 'em. For example: chidori and rasengan. Granted that they are both very powerful, they only work when you can actually hit the enemy. A lot of enemies are quick, and can dodge or counter the attack easily. Itachi is a great example of that. All he had to do was move his hand a little bit and the chidori was suddenly useless. It would probably only work if the enemy was pinned somewhere. Anyways, in spite of that, chidori and rasengan are both used over and over like they are the best of the best jutsus, even though there are about a hundred things anyone can do to counter it. As for underrated jutsus, am I the only one who thinks that Ino's soul transfer technique has some great potential in certain situations? Think about it, all she has to do is catch the enemy off guard and use it. Then there's nothing the enemy can do. Then she can do whatever the hell she wants, like spying, or just knifing one of the enemy's friends in the throat (hey, they wouldn't see it coming), and so much more. Even Chouji's ability to become a giant is rather underrated. When a fat man the size of a tall building starts rampaging, what the fuck are you going to do? Use chidori on his pinky toe? No. You haul fucking ass, assuming that you don't have skills comparable to any Akatsuki member, Sannin, or Kage.