Well maybe and maybe not. Let's not forget it's the same league that Kecpaia and Dabizas came from.
Anyway, in regards to Mehdi, he copped a lot of stick in the begining of the season for ball-hogging, being caught in possesion and not squaring when he should have. He got benched for that and came back stronger.
Overall, he's very good tactically and he has good positioning in the opposition goal mouth. His main position has being either as defensive midfield or playmaker (The point of the 4-3-3 system). He's strong on the ball but lacks pace. He also has a tendancy to give away silly fouls.
Darrem Ambrose is a Championship striker who's happened to be unlucky in his career with injuries. He did well for Laurie Sanchez' Apollo Athens only to be outdone by match-fixing in the League.
A fairish comparisment of the qualiy of the teams in the Greek League (Oympiakos, PAOK, Panathinaikos could stand in the Premiership, another 3-4 teams in the Championship and the rest would probably be League 1 teams)