Okay, so I'm playing Higurashi right now and have just finished Onikukashi.
As for what I think about it, hmm... Well, I'm torn between two sides. The first one will be that the incidents are human-induced, and I have a very clear idea exactly who is the culprit and his methods of murder. Of course, that needs further clarification.
The second one will be... was there ever a culprit? Could the entire tragedy actually just a series of unfortunate incidents? So far it still hasn't been a mind fuck for me, so I'll have to wait until the answer is revealed. If it was though, that Higurashi was only as good as a 'two time' trap... I wonder if this could be a golden 3, like the one Mion played on the protagonist during their first card game.
On to a little bit of spoilers (and general dissatisfaction for this protagonist =_=" A totally - useless - wimp):
1. The protagonist, for some reason totally forgotten the fact that his friends were discussing about the incident while he was 'asleep'. This alone should've told him very clearly that they are NOT the murderers, because if they are the topic of discussion would've been much more 'intimate'. At the very least, he should've known that there is no way Rena is Satoshi's murderer no matter how insane she had acted. The clear evidence to that is one, she considered herself one of the possible victims of the curse, and that means whoever that's killed Satoshi it could NOT be her. Two, she seemed to have experienced an incredible trauma before the protagonist had moved in, thus translates to her mad belief in the curse. I highly suspected that the one trip Rena took with her 3 previously very 'close' male friends is a rape crime. Rena and Mion had truly tried to protect and save the protagonist - Rena was a bit insane so you can't blame her for carrying a cleaver to 'guard' the protagonist, Mion had seen a similar tragedy happened from the sidelines but was helpless to do anything (this line is an assumption) and wanted to prevent it from happening again.
Btw, the protagonist's eeriely similar death to the reporter's could actually be explained - which is not really that scary. The boy first step to hell was when he heard in detail how the reporter had died - clawing his on throat to death, and it was literally the form of death for him and an unwavering fear constantly haunting behind his back. It is not surprising that at the very end, when the threshold of his mental sanity finally broke under pressure, that he would mimic in the same way how the reporter had died. His mind was telling him subconsciously that that way of death was how he should die.