No pun intended - any movie that can be compared to the Exorcist is already in losing ground ... but if you are able to put your own spin to it (that's not a pun - so I'll allow it, the power of ... review compels me) ... and add some humor .. why not go for it? That is a rhetorical question obviously.
The acting is really good too, which of course is also needed. The main character may be morally in a grey area, but that may make the movie and him even more interesting ... I think you should be able to root for him ... it comes down to casting and who to choose for a role that is quite tough to pull off ... cinematography is really good and the editing helps the movie too. It may not reach the heights of other movies (mainly the already mentioned movie that stands above all) ... but it is a nice one to watch for sure.