Tell me about Huskar

Hi r/DotA2 I was wondering if you could help me understand Huskar.

Whenever I see a Huskar on the enemy team, I fear for my safety. He seems to be such a potent hero, especially in the early game. I just played a game against a Haskar, and this was certainly the case. Once he hit level six, he could kill me (Vengeful Spirit) at will, even under a tower.

However, my team managed to survive a brutal mid game and close out by taking two sets of rax in the late game. Huskar was still scary in team fights. He was consistently getting at least two kills in every fight, but he wasn't carrying the fight. He would dive one hero with his ult, then kill another and then get focused down quickly, at which point the surviving members of my team cleaned house.

Other times; however, I have faced against Huskars who have been beastly throughout the game, even well into the late game.

Why is Huskar so potent in the early game? Why does he have the potential to fall off in the late game? How can he continue to have a strong presence into the late game?