Monsters AI is like 5 years ago

[Nospheratu]

I'll jump on the band wagon here and say that the OP is basicly doing it wrong
The first thing you should consider/read is the starting instructions like not playing to win and immersing yourself becouse that's what this game is all about. Then, like others said, also keep in mind that this was ALL made by just 5 people (instead of 50 - 100 in big companies) who worked for minimal wages just to finish this game. Third and most important of all - monsters are not supposed to climb obstacles or behave smart, becouse the point of a player seeing/hearing a monster is to run away from it and hide in some dark corner, not to jump on a table and dance in front of it while laughing at how stupid it is. You can do that ofcourse but as you already found out it will only prove that the monster can't reach you and that you are thus the smartest person in the game, yay.
Writing such stuff here is like going to a cinema to watch a horror movie and then at each scary scene shouting "That is FAKE BLOOD!", "That's just a man in a rubber suit!" or "In reality this wouldn't work AT ALL!". Everybody knows that, but that's not the point of watching a horror movie, is it
Also in regards of pirating this game becouse the expirience wasn't worth the money (your opinion) I'd advise you to read the increasing number of posts of pirates who have already finished the game and then bought it becouse they were so impressed with it (I am one of them); I'd say that reality proves you wrong on that point.