On the contrary I don't think the problem lies with Martinez's ability to spot a player and pay money for him as those he has at Everton have been successes. The issue is if he can use them to find consistency and to move up a level as Moshiri will surely demand. It's why I have no problems been given money to spend in the summer as if he can't get the best of them then they're likely to still be good players that someone else will.
We're a much more stable entity than Newcastle and it shows. I wouldn't let your anxiety run amok too much citing them as a foreboding of doom. Their fans deserve it too for delusion, narcissism and hysteria.
Lukaku - 2 successful seasons in the premier league, proved himself on loan therefore signing was very limited risk.
Barry - proven player. Loan initially therefore zero risk.
McCarthy - already a known quantity from RMs Wigan days. Good first season. Meh since.
Del - loan initially showed he can do it in the premier league. Remains to be season if he can be a starter in a successful premier league team.
Kone - known quantity from Wigan days. Has contributed very little.
Cleverly - known quantity from Wigan days. Decent value for money squad filler but nothing more.
McGeady - waste of time but cheap.
Lennon - proven premier league player. Does what he says on the tin. Good value for money.
Funes Mori - goals have hidden defensive errors. Jury is still out.
Besic - clear potential but yet to make a significant contribution.
Niasse - too early to judge for some but doesn't look great.
RM had mainly signed players initially on loan, those who he knows from Wigan and a couple of proven premier league performers.
Apart from Lukaku, he hasn't really made any signings as good as Arteta, Cahill, Baines, Pienaar, Lescott or Jags as yet.