While I usually prefer watching English speaking films (cultural indoctrination and conditioning since childhood, not completely my fault), foreign films have the distinct advantage of usually having a different and unfamiliar atmosphere, making even all too often made before films feel new and exciting. Sadly, this is in my opinion the only good aspect of We're Not Alone, which is another usual and ordinary imitation of a default storyline.
The plot itself isn't bad, but is far from original. A new house, supernatural occurrences witnessed by only certain members of the family (whom the rest of the family doesn't believe, of course), a vengeful ghost, a priest with past experiences involving the house, all sound and feel familiar because they are in fact familiar, we've seen this before. The attempt to add a small exorcism part (lasting around 10 minutes) feels forced and unnecessary. Altogether, this film feels like a botched attempt to make an already used storyline feel new.
However, this isn't to say that We're Not Alone is bad, as with lowered expectations it could be quite enjoyable. I personally liked the ghost's design, the relatable characters and the above average acting. But I would completely understand anyone who didn't feel like it was their job to look for good parts in a film, and without consciously looking for those - we're looking at a disappointing experience.