In his defense, the 3rd is also the only Hokage in his 70+ years and has his chakra capacity halved by the time he died. It's true that he hasn't shown any special fancy technique like teleportation or wood technique.

While everybody has special powers, he's supposed to have studied all the ninjutsus well and is able to perform them in combinations at high levels. To me, he sounds like he's Kakashi with lots of brains, shitloads of chakra, minus the sharingan.

In the video games he's a pretty boring guy though.