a metal(aluminum) bat can absolutely be mangled against harder or denser surfaces to the point of being a poor poor substitute for a bat but still will remain an OKish club. however, being aluminum they are really kinda light. sure they can be swung very fast and even make for a quicker follow through and subsiquent faster redirection and repeat swings but they kinda lack the mass for a truelly devastating crushing blow...
that said when you role out of your ride with a bat to quite possibly get into a brawl people immediately think "i don't want to get hit, but that asshole may not have the sack to hit me with that bat".
but when you roll out with a mangled aluminutm ball bat those same folks will think "fuck, he may or may not hit me with that bat, but he's sure as hell hit something".
if i can find it i'll post pics...
K.