He's half African American so I see no problem with him playing Luke Cage.
Regardless of who you cast odds are it's gonna be someone who either doesn't quite look the part or isn't a capable enough actor/leading man.
half ain't good enough for me i just wont support the film if they go that route.
i remember a time when movies use to break unknown talent. now it seems like studios just go towards actors who already has a their own brand. i just hope they don't pull the similar jew tactics and have a mixed breed playing black panther.