I like the Conjuring movies and Annabelle.
The only problem I have with Annabelle and the other upcoming prequels (Origins, The Nun, and The Crooked Man) are that they're just unnecessary.
All Annabelle tells us is how the doll got possessed and how the couple from the first movie got it.
The reason for this is that it's already explained what Annabelle and Valak are: they're demons.
Really, there's nowhere to go from there. Everyone knows what a demon is and what it does, we don't need four movies explaining it.
Just make Conjuring 3 already.