I'd much rather have had Matter-Eater Lad eat away at the Post-Crisis than Superboy-Prime punch away at it.
Actually, Matter Eater Lad might make a really scary VILLAIN, the kind the Justice League has to be called out to whoop on. Provided of course, that he was over a hundred feet in height, so that he could eat skyscrapers and suspension bridges.
When Paul Levitz revealed that Colossal Boy was Jewish in the 1970s, I thought to myself, "hey, why not Matter Eater Lad too?" There's nothing in the Torah specifically denying Titanium, but I'll have to ask a Rabbi about Cobalt, the shellfish of the Periodic Table of Elements.
Hey, when Matter Eater Lad gets flatulent, does he give off Noble Gases?