Wanting game balance is an idea that has been around long before DikuMUD ever crawled up onto Telnet. The simple explanation is that a game is about having fun, within the structure of the rules. However, no one likes to be Bulma next to someone else's Goku. To take D&D as an example, in 3.5 if you're a caster in a low level game, you suck, and hard, while the rest of your team is stronger, better equipped for fighting, and in general just better able to handle the challenges of adventuring. Take the same caster in a high level game, and you are practically a god, while the rest of the team is there to keep the nasties off you while you nuke them. D&D 4 is a well balanced combat system. However, they achieved that balance by stripping out everything that every other edition of D&D before it had done, and eliminating the customization that was the hallmark of 3.X. Which is why some people hate it.