I suppose it's just a matter of opinion really. The evil grandma is definitely, as I said, cliche, but in that there will probably still be some creepy moments (like the "I'm gonna get you" scene where they were crawling). The issue with Shyamalan is that he is a very talented director, but tries to take on too much. As seen before with movies like The Happening, Avatar, and most recently After Earth, he tries to show his skill by simply cramming as many techniques and gimmicks into a movie - usually ending up with a movie that has no genre, no overarching themes, and no coherence whatsoever. The laugh track and the found footage elements are a sign of this, where he wants to create something with a James Wan-esque horror vibe (some of the trailer looked directly ripped from the Insidious movies), but he wants to put a spin on it (call it a directors twist, if you will), where he wants to also make a found footage movie as well (gimmicky movies can work - most recently Unfriended is a sign of that), and his unusual (and probably unsuccessful) blend of styles it what makes it seem amateurish to you, probably because you have knowledge on the area so can see exactly what doesn't work. The one thing I have no doubt about is that this movie will have great camerawork. With the exception of Avatar and Lady in the Water, Shyamalan's movies have always had great cinematography, so I feel most of the scares he will be going for in this will be based on framing (as seen with the granny crawling around the corner, sitting in the corner, opening the oven behind the girl), and whilst this is again cliche, it's not to say it won't work. I am quietly optimistic.