Well, I see where you're coming from.
Anyways, Zant, to me, is the representative of many things that is bad about humans. He was a greedy little turd. He was a guy who wasn't able to move on after Midna was chosen to be ruler instead of him. He was (in his mind) more capable of leading a people better than Midna, so he was upset he wasn't chosen. He was a big coward, who couldn't do anything by himself, as well. Let's admit it, Zant was as mental as Majora was(of course, in a somewhat different way). When Ganondorf gave him power, he was to become a machine of destruction. He was vile, and hated people, so he unleashed his wrath over everything, both the Twilight Realm and Hyrule.
His mental stability is also, well, unstable. We can see this because when he had the power, and everything was under control, he was this cool, calm, collected villain. We see this when he attacked Castle Town, and when he confronted Link in Lanayru's Spring. Although he was still cool in Lanayru, we could see his deranged mentality leak out. The guy was frustrated, because Link came that far already, and he was sure that without his personal intervention, Link will succeed. Fast forward later to when Link managed to get to his throne room in the Palace of Twilight, we see the true Zant emerge. He was upset because Link (is almost about to) foil his plans. He seen his plan shatter right in front of his very eyes. It's just like how he was when Midna got the throne instead of him.
“I had served and endured in that depraved household for far too long, my impudent princess. And why, you ask? Because I believed that I would be the next to rule our people! THAT is why!” ~Zant
See? Now, I still sympathize for him, because he was neglected, and unwanted, but he was still a low villain. That said, I still think that Zant was one of the most bad*** villains the series has seen. :yes: