No matter what age he's  pitching at, whether kids, YA, or adult, RL Stine writes in exactly the same way with exactly the same tone, which is odd. First story: entirely typical Stine fare. Not very good, but familiar and easy. As in a lot of horror of this type, the whole shebang could have been avoided if people had just been calm and talked to each other about what was going on. Also: entirely creepy main character guy. Obsessive stalker vibes throughout.

Second story was better. Much preferred this one. Felt like one of his Point Horror stories. I feel like Stine is better when he doesn't get too tricksy. This one was straightforwardly non-supernatural, which was an improvement. 

Third story was my favourite so far until the ending. Very simple, I Know What You Did Last Summer vibes, nice island setting. Slightly more believable, well-rounded characters than in the other stories (although it's a low bar). I just cannot believe the characters would not face more trouble in the end, regardless of how it all pans out, and that weakened it overall.

The final story was the weakest, in my opinion. The stakes were simply too high, and the dog killing bit was too upsetting. There were characters who just didn't need to be in the book at all, and nobody acted at all in believable ways. The whole thing felt a bit phoned in.

Overall, if you're reading this now in the reprint, you're either a big Stine fan or you read them as a kid, and the nostalgia will carry you through this read. If you're coming to them fresh, they're not great.