City of the Living Dead from Fulci
Why the hell did they panic when the kid was running towards them. There wasn't anything wrong with him?

Well I partially agree that Fulci got a bit lost in his love to show gore or just plain weird and erotic scenes (NY ripper is a good example of it) that as viewer it's easy to get lost what the movie is actually about or in worse case loses his attention, gets bored or even dozes of. Totally different from HG Lewis whose gore flicks keep me entertained from first to last minute, even the filler is often amusing.
I think Fulci however came up with better conclusions in his earlier giallos even though personally I didn't find those that satisfying either. Sometimes it was too easy, too coincidental or far fetched. Zombi 2 I think is his best along with HOuse by the Cemetery. The latter in my opinion had potentially the best story (even though the execution felt flawed ans rushed at times) and a quite satifying ending open for different interpretations.