Minato is not considered strong because of flashy (no pun intended) techniques, but because of his skill and intellect. He instead defeats his opponent with strategy and the FTG, and luckily, most people he faces are not immune to having their throat slit
He doesn't go flying around destroying buildings and smashing rocks, but it only took him a few panels to make A and Kirabi his b!tches. He's also, to date, the only person to really hurt Tobi without dying or taking damage at that.
Of course, Minato has a great defense against large scale attacks due to his skill with Space Time barriers and such. He also has sealing jutsu. It just goes to show...big explosions and surreal jutsu are not always necessary to be dangerous.

Of course, Minato has a great defense against large scale attacks due to his skill with Space Time barriers and such. He also has sealing jutsu. It just goes to show...big explosions and surreal jutsu are not always necessary to be dangerous.