I've always thought of Martinez as Suarez's successor at Barcelona - the man they should have signed instead of the past it Aguero, if they weren't broke that is.
I like his hustle, I like his intelligence, I like his finishing ability - I see him as a bit of a mix of Suarez and, coincidentally, Aguero (or maybe Tevez, if I was comparing him to just one player) - and I'm sure in front of Messi and a dominant, technical midfield, he'd do bad things to La Liga defences. I'm just not sure Xhaka, the rest of this Arsenal team and the brutes of Premier League would see him flourish here.