I guess, since I hear they half-spoiled the mystery of Snape's allegiance*, they had to replace the questionable villain with someone... to do it with themselves was an odd creative choice, though.
* - I dunno. Maybe that'll come off differently since they never spent any time on this issue to begin with, merely made him a bit antagonistic to Harry. If I were movie!Harry, after the first movie I'd never wonder where his loyalties were, I'd just think he was a surly git. So either the end of HBP is going to be the most confusing bombshell in all the movies and spark a whole new wave of OMG SNAPE SO EVIL which will have book-fans headdesking, or it is going to fall entirely flat with no punch whatsoever.
(And yes it seems these are the only two possibilities for this Mrs Ranty McRantpants who today is playing the part of esmestrella. :P )
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* - I dunno. Maybe that'll come off differently since they never spent any time on this issue to begin with, merely made him a bit antagonistic to Harry. If I were movie!Harry, after the first movie I'd never wonder where his loyalties were, I'd just think he was a surly git. So either the end of HBP is going to be the most confusing bombshell in all the movies and spark a whole new wave of OMG SNAPE SO EVIL which will have book-fans headdesking, or it is going to fall entirely flat with no punch whatsoever.
(And yes it seems these are the only two possibilities for this Mrs Ranty McRantpants who today is playing the part of