Kizaru's strength in 'One Piece' is honestly terrifying when you break it down. As one of the Marine Admirals, he embodies the pinnacle of the World Government's military might, and his Devil Fruit, the Pika Pika no Mi, lets him move at the speed of light—literally. Think about that: instant teleportation, laser beams, and kicks faster than most characters can react. His casual demeanor during battles, like when he wrecked the Supernovas at Sabaody, shows how little effort he needs to exert to dominate.
What really cements his power, though, is his role during the Marineford War. He fought Whitebeard's commanders without breaking a sweat, and his ability to intercept Marco, a top-tier fighter, speaks volumes. Even now, post-timeskip, I doubt many characters could handle him without extreme diff. His only 'weakness' might be his laid-back attitude, but that just makes him scarier—he’s never even fully tried.