He's actually low-tier. Assassin isn't on the same level as "D". Sin attacks one person with a 3-D attack. "D" can kill ten people on horseback at once without even having been seen draw his sword.
Assassin from FSN, He can create three simultaneous cut, that move at the same time, with only his skill
Gin Ichimiaru? From BleachGin's not all that skilled and most of it is his zanpakutou's power. The extension thing also wouldn't work. "D" is just insanely faster than him and possesses greater skill. Long range doesn't help against a guy who can cut Space.
Vampire Hunter D Vol.14 "Dark Road Prt1&2" Page 194
The exoskeleton was equipped with automatic repair circuits. They would work to restore not only the armor, but also the person using it.
D's sword had narrowly missed Roland's heart, instead piercing his right lung clean through to his back. The laws of physics said it was impossible to penetrate the armor, yet the swordsman had come to within a fraction of an inch of skewering the man within it -- thanks to his peerless skill with a blade. What's more, Roland's cellular tissue wouldn't knit back together. An injury from an ordinary sword or spear -- or even from a bullet -- could be healed by the ageless and immortal flesh of the Nobility in the blink of an eye, with the wound closing immediately. Even nerve-cell damage that human beings never recovered from could be repaired by an ability on par with the mythical Hydra. It wasn't a special sword. And this hadn't been some bizarre sword technique that could bend three-dimensional space. It was just an ordinary thrust. And yet, the ravaged cells gave the duke searing pain, and the lifeblood gushing out required immediate medical attention.
Not fast enough. Jack has that whole magic sword deal, and he only gets a Plot-Power that lasts like One Episode. Everyone loves Samurai Jack, but he's just not in the same league here.