Hmn maybe, maybe not. Though maybe the kid should decide if it is shit or not.
I never really thought about it before, but my gateway into comics may not have been the "normal" (eg. Marvel/DC) comics of the day... I think I actually started off reading more Harvey (Richie Rich, Casper, etc) and Archie. Those are kinda in the "all ages" vein. I did love my superheroes, but I didn't start heavily collecting them til later.
Of course kids of today may be different (and no two kids are exactly the same), but it may not be such a bad thing to have a start that is not a mature title, just to get them to love comics and reading.
All kids are different. I mean, I got into comics the way Punchy described, reading Kraven's Last Hunt, random issues of JLI or Batman, Claremont's X-Men, the Midnight Sons stuff, and things like that. That doesn't mean that's the only way to get into comics or that superheroes are the only way to introduce books to kids.
There's just way too many options to say that everyone should get into comics the same way. No one would say that about TV or movies or books. Sure, you need some early learning stuff when it comes to learning to read, but beyond that for kids to develop interests in anything it's going to be different from kid to kid, and comics are no different.