Ahem...Necron was a giant space flea with the ability to reset all of existence as wel know it. That alone makes up for the fact that he's the second lamest plot device I've ever seen in a Final Fantasy game. It's just...I mean, how can you make fun of a giant omnipotent space flea?! Honestly, that's, like, the coolest idea in the history of JRPGs. You guys can have your evil wizards, supernatural swordsmen, and corrupt sorceresses from the future. I'm playing the game with the giant freakin' space flea.
Space flea? I honestly don't think I could have come up with a worse insult. Your sarcasm would have worked much better if that had even made the least sense. And if you'd payed attention to the story, you would have figured out he actually does have a place in it. Granted though, he's really not so much of a villain as a creation with a set purpose. He's not really good or evil.
I do agree with Rulia that he was a WAY better boss than Yu Yevon. At least Necron presented a challenge...well, if you didn't have all your abilities learnt, anyway.