Rifts is a game with plenty to poke fun at. I obviously have a great deal of affection for it, but it's rather ludicrous, as others have correctly pointed out. I think the frustration Rifts causes for some is largely derived from a misunderstanding of what kind of game it is: as I've mentioned before, if you're looking for a post-apocalyptic science fiction setting, you're in the wrong place. But if you think of it as a superhero setting, it's fairly tame.
I got into Marvel Comics as an adolescent, a little while after I started with anime and manga. I started playing Rifts around the same time, so my take on the game was essentially a fusion of those influences. The things that seem so ridiculous to many people didn't really faze me: after all, most of it was less crazy than the Marvel Universe. (The DC Universe is even wackier, depending on which version you're talking about.)
In Rifts, much of central North America is under the bootheel of the Coalition, a censorship-happy, human-supremacist fascist state ruled by a guy named Emperor Prosek, who really likes skulls. Practically anything the Coalition manufactures has a big ol' skull on it. To think that most of their citizens believe they're the good guys stretches credibility pretty far. But Marvel's Doctor Doom is similar to Prosek, plus he's a wizard that wears power armor, and who builds things like time machines as a hobby. Prosek has an army of robot skeletons. Doom has as an army of robots that literally look exactly like him. Is Doom silly? Pretty much. Awesome? Well, I think he is.
Almost anything Rifts (or the Palladium Megaverse) has -- dimensional travel, mythological gods walking the Earth, mutants, talking animals, psychic powers, wizards, giant robots -- the Marvel Universe has, but in a more over-the-top fashion. Heck, the Marvel Universe is supposed to be happening in the present day with a largely recognizable modern world, despite the presence of all this crazy shit. I love Marvel, but you've got to admit that at least Rifts has the decency to say "this is in the far future, after an apocalyptic event". Nuff said.
Now, if you don't like superhero stuff either, then yeah, I can see why you'd have a problem with Rifts. (And that's not even getting into the rules.)