Kendo is a sport, and by learning kendo you get good at the sport, not swordfighting. Yes, you scream a lot. It is fun depending on your sensei and your idea of fun. If you want to slap on some armor and whack people with sticks, then kendo is not for you. In a traditional (good) dojo you will practice drills for months before you earn the right to wear the bogu.
As far as that whole berserk samurai nonsense is concerned, I can only assume you're joking. Japanese martial arts are some of the oldest in the world, and without a doubt the most regimented. The assumption that the sport of kendo was some attempt to get "scientific" about swordfighting is silly.