Why are you asking? You have obviously seen enough of him to know that he is going to "cost us again and again"
I'm amazed that so many posters have watched enough of Cuco Martina to dismiss him as crap. Are people honestly saying that they have watched him over a period of time and seen enough of him to justify that opinion ?
I'll be honest, I had never heard of him and I don't recall ever watching him once, let alone on enough occasions to form such a strong opinion.
I would be surprised if you have seen more of him than Koeman, who obviously feels that he is worthy of a place in the squad.
Said it numerous times and never been wrong. I wish I would be but this will be another failure. If you rate him you probably don't watch football
I don't rate him mate (read the post you replied to) and I do watch football yes, mainly Everton as it happens.
Obviously I don't watch as much football as you do, because you must have seen quite a bit of Martina in order to make an informed opinion.
So tell us, just how many times have you watched him play?

