Video Game Bosses

Now, I can handle the fact that in some games the boss at the end of the level is bigger or stronger or more skilled in the arts of whatever, but what abou those guys that look just like everyone else you've been fighting, but it turns out they're like ten times harder to kill? I mean, did they like take some potion that made them a slam-bam fighting machine? And, if so, why didn't every one of their meaningless henchmen that has nothing better to do than patrol your way in or out of something drink some? Case in point is this Geonosian dude I ran into on Mustafar in Battlefront II. For some odd reason, this guy had they entire 501st shooting at him, and it still took him two minutes to die. "Hey Mr. Creepy Bug, whatever you're on, why aren't you sharing?" It's all very confusing. Well, I gotta go rehash my meaningless life.