I think he was quite solid, could have done better for the 3rd goal but didn't see it as a height issue, more a slip/collective failure. Probably not wise to play him with Fred/Eriksen midfield though, which both is incredibly porous and can't win headers or second balls. Ultimately it comes down to systemic failure not something that is solely on Martinez. Hence why all the players we bring in look dross. Put this guy in Arsenal, City or Pool and he looks great. Because they dominate possession and when they lose it, work as a team to win the second ball.
In any sane team, it would be fine for them to be predictably pinging balls at Martinez because there would be a powerful DM there to either cover or sweep up, plus he wins a fair share of them himself.
He is one of the few players in this team that still has fight in him, and a winners mentality. It's kneejerk to get rid so early. Pair him with Varane and Malacia and he'll do better. Despite the issues with Malacia's height too, which again need to be covered by a decent DM.