I'd definitely keep martin. Partly because he's a genuinely good kicker but also because,whilst he certainly doesn't rip up trees, he's a good, solid and experienced player in a position that whilst we have the quantity im yet to be convinced on the quality.
The big question is, have they already lined up an upgrade or are they now back in the (always crowded) market for props? I really hope it is the former and not the latter. Don't want to be drifting toward Christmas with holes in the squad this year.