Scifi channel has a reputation for picking up awful B-listers to fill out its empty Saturday nights. Unfortunately, Wraiths of Roanoke is no exception. Within the first ten minutes, the acting will tip you off that this'll be an unimpressive title; indeed, the acting is very similar to such mid-budget series as Stargate SG1 and Painkiller Jane. Of course, the fault doesn't lie entirely with the actors, only so much can be done with the stale and entirely trite dialogue.
The story isn't much better. The basic outline involves British colonials, who intend to inhabit an island, finding their old garrison "abandoned" (read: dead). The Native Americans (Croats) give vague warnings about some mysterious danger, only clarifying things when the first people die. From then on, the settlers (who can't abandon the island for a few reasons, some of which are inconsequential given the threat) are forced to contend with evil spirits.
It's supposedly based on true events, which seems to be a big selling point. However, given the film, I can't imagine how many liberties were taken. I imagine the only truth involves the abandoned fort--which could've just been sacked or what have you. Wraiths happens to be one of those films where you can see budgetary constraints in everything and it suffers for it.