>>101079914They allow for a nominal variety of stories, while also nominally working well together or themed well together.
Batman has tons of gadgets to assist him when his peak human performance fails him, Superman can both do everything a man can but SUPER (heh) alongside a couple things a man wishes he could do like fly, Iron Man showcases amazing technology with tons of cool doohickeys and things you can do with the suit, Wolverine's a deadly scrapper tailor-made to fight with his claws and healing status, and Spidey is an acrobat extraordinaire with web-slinging/wall-crawling/his strength and agility. They also are really good for straight-up action stories, which is important for a visual medium like comics.
This in turn allows a batch of villains to oppose the hero in various themes - motivation, power sets, or psychologically. Batman and Spidey have the best rogues' galleries in comics, Superman has Lex and a bunch of good but underrated baddies, Wolverine at least has Sabertooth and is always fun to set loose on a lot of different villains, and Iron Man at least has potential, as /co/ constantly talks on.
