I dont mind them trying to keep inline with current canon, but i doesnt bother me when a new film comes out and changes everything. Maybe because its been happening since A3.
I didnt care much for the titan books myself and found the mental gymastics caused by trying to fit them in between the films made them feel a bit corny. Especially bringing ash and ripley back in Out of the Shadows.
I enjoyed how fire and stone did it though. I dont think the inclusion of the predators made it too muddy, its not stated specifically how long the preds have been hunting aliens so it still fits in with the current canon well enough i suppose.