no matter how much of a threat you may pose to some evil genius's sinister plans, at the beginning they will only send feeble henchmen and lackeys with far inferior weaponry.
The Atomic powered full automatic nuclear catapults, and all the other sweet weaponry that could actually do some damage, will only be deployed to stop you once you've tracked down the villain at his third secret base.
And even then, only moments after you've stumbled across the weapon that happens to be their weak point.
Also, any series of defense structures, security checkpoints, or Death-traps will always have a puzzle or sequence of consoles render them useless; conveniently placed in their blindspot.