(watched all 4 seasons)
Thought it was a really interesting premise from the start. probably would give first season 5 stars.
However it then loses its way, it felt like the plot was being written after each season as there was no real coherent ending as to why each individual thing happened. It just says 'this is why nothing made sense' in the last episode of s4.
I thought the acting was good at most points, although Grint's accent was bizarre, Kebbel's was ok if he is meant to be from Boston.
I did enjoy the growth/transformation of the characters, but thought it a bit silly they a) never learnt their lesson b) in the final episode made 2 of them change their entire characters goal.
Overall I won't be recommending it to others to watch, but I also won't tell them not to.
*spoiler below*
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Do not watch if you don't want supernatural powers involved.