That's what's so great about it! It's pure Corey Feldman in the Goonies trying to look all macho or something. It's shot by Ben Weller by the way.
I'm never really averse to seeing Zac on covers, I think he can photograph really well and to me he belongs on this kind of magazine rather than GQ and such. In magazine terms he's not really over exposed here, in fact, is this his first British cover?