The system of interrelated games has no concept of or concern for balance. Remember, the core RIFTS book include the playable OCCs of the Glitterboy and the Vagabond.I have played a little Rifts, and "gonzo" is the word I use as well. The setting feels very artificial.
I also tried some Heroes Unlimited. The character archetypes (randomly rolled) are grossly unbalanced in power. Some are skill monkeys, and a few skills are problematic. (Boxing was mentioned.) Some roll random mutant powers (or do you choose? - I forget). Some buy cybernetic parts or other technology on a budget. Three very different build systems, and how could you balance them?
What I continue to do is roll random HU superheroes as seed ideas for HERO. It is great for generating ideas.