If Martinez came here he wouldn't make as many mistakes on players as he has done at Wigan, for a few reasons.
1) Bigger club which cant attract better players in the first place, less risks
2) Better scouting network
3) Able to pay much better wages
He might still buy the odd jarg player, but then so did Moyes. Everybody does.
Do you expect Moyes' record in the market to improve too, then?