Lets check out his track record (according to the Witnesses).
1. First, he decides to rebel against the most powerful entity in existence that is omniscient, omnipresent and omnipotent. Which of course, will doom him to failure the second he begins.
2. Then he starts his brilliant plan to trick Eve as a talking snake, interesting how that worked out since snakes don't talk. (Good thing Eve was more stupid than Satan).
3. Next he bets against GOD (again) with Job. Wow, turns out God was RIGHT (shocking!)
4. His final act in the Bible is that of his temptations for Jesus (God's second in command! With eons of experience). This included telling him to turn stones into bread, jumping off a cliff (I thought that was just a slang term "GO JUMP OFF A CLIFF" but he seemed to use it literally) and finally offering something (the kingdoms of the earth) to Jesus that he has on LOAN from God if he did an act of worship to him.
I think I can reasonablly conclude that Satan the Devil is an imbecile. I have seen evil schemes by James Bond villians with more chance of success!
-Sab