Well, Djimon has an AFRICAN accent. Jamaican and African accents aren't the same. If it was African, as Djimon's would be, it would be awesome.
EDIT: Sorry, I haven't actually heard the voice of the Prothean yet. I've only taken peoples word for it. Their word said it was Jamacian...In my opinion that would be stupid. I mean, who wouldn't think that a Jamacian Prothean wouldn't be stupid?
And, SpaceSweeper, please, don't try and turn this racial. It's not. If it was a dumb white hick Prothean, I would be upset. If it was really any accent that sticks out, it would come off as unreal and I would be upset.
Personally, I think they should just leave the Protheans out. But, since there is one, I think they should mix several voices, or run it through some programs or something along those lines.
And, I am incredibly upset that they are only doing this as a DLC both personally and story wise(Its a f**kin PROTHEAN). At least most of you will get it several months before the rest of us.