Stelios, I suppose it all depends on what interests you most about superheroes. I grew up playing with...Shogun Warriors, which were based on super robot anime (Ufo Robot Grendizer, Getter Robo G, Mazinger Z) created by...Go Nagai, Leiji Matsumoto (Danguard Ace) and others. I have read...Iron Man since I was about 7, and I have always enjoyed films/anime series featuring high tech hardware as a result. Examples of a high tech show would include...Knight Rider, Airwolf, Blue Thunder, Street Hawk, The Six Million Dollar Man and The Bionic Woman. I also used to read...Marvel's Shogun Warrior comics.
Getting back to your query...Guys in robot suits/piloting Super Robots, seem invincible, and thusly are able to protect their nation and the people they love. Big Guns are even easier to understand, as they carry tons of ammo that cause massive...Colatteral Damage, and bring death to their enemies.