The Rook is an interesting series with some fresh ideas, beautifully filmed, but a bit slow for its concept and not showing enough characters' powers in action.
The main female character's play is mostly bad and cringe-worthy with awful psychological state of mind.
Most of all, the series lacks fluidity and logic from time to time, very often showing sub-plots and 'random' pictures and acts, leaving it to viewers to link them all together in relation to the whole story.
If they aim for a second season, they need to lube all parts of the story and script up, show more in-depth action and tangible use of characters' powers.
The characters interactions together need to be more polished and realistic. In its current state, they are more like pieces of a puzzle, shuffled together and piled up.
All in all, a fresh series, still raw, having the potential to receive a nice polish and shine to brighten up like a diamond.