Yeah!
Plus he was the only villain that even DESERVED to take over Ninjago. He really had done nothing very evil before he was trapped in the teapot. Sure he was a pirate, but that's not villainous, just bad.
He became a villain when he brought his crew to his beautiful realm to live and found it in ruins and his people dead (why don't more people put emphasis on this? Nadakhan was going to leave Ninjago but it was THE NINJA that destroyed his realm, his people, and that turns him evil. I WOULD TURN EVIL IF SOMEONE DID THAT TO ME!) Nadakhan was the only villain that actually DESERVED to win. He was so nice to his crew, he viewed them as his friends!
But what do the Hagemans do?
Rather than leaving Nadakhan as a likeable, almost NOBLE villain, they destroy him by making him UNCHARACTERISTICALLY turn on his crew and betray them. They're his friends! Practically family! HE WOULDN'T DO THAT! -_-
Nadakhan loved his home world so much that he wanted to turn Ninjago into it. Because he missed it and it was the ninjas' fault that it was gone. He wanted to turn Nya into Delara because THERE WAS NOTHING HE WOULDN'T DO FOR THE LOVE OF HIS LIFE! I don't even think he would have been a bad ruler of Ninjago-turned-Djinnjago. Even though they weren't his own people, I don't think Nadakhan would be a dictator. He was a captain, he didn't force any of his crew to do anything. He was actually pretty darn fair and sensible, despite having just lost basically everything he ever loved.
(that was so long XD and sorry for all the CAPS, I can't do italics or bold, so that's the only way I can emphasize stuff X'D )