I'd say mostly because IT'S A TERRIBLE MOVIE!
It's not meant to be some critically acclaimed film.
Well then why are you expecting it to be LOVED?
It does a good job of keep the audience engaged whether through Kale and Ashley's romance or the killer's actions. I really enjoyed it.
You are easily entertained. But I require a little more THOUGHT, and LOGIC. Movies with stupid people, that have stupid scenes in them are not enjoyable to me, no matter how "engaging" they seem.
Case in point: The idiot, vengeful cop who neglects his responsibilities decides to finally show up at the right time, can hear Kale dropping objects and making a ruckus in the house, but somehow can't hear him calling out for his mother? That makes a lot of sense!

It was the best bad ripoff of "Rear Window" they could possibly make.
God knew he was good and God did look the other way that day.

I don't know. I feel like it did what it set out to do: entertain me. Like you said, it's not like this is supposed to be some amazing critically acclaimed movie.
Once upon a time there was a magical place where it never rained. The end.

What was half assed about it ? And which part insulted the viewers intelligence V

No it really doesn't. It's very half assed-ly put together and an insult to viewers' intelligence.
No, it really isn't. It's a good, enjoyable, well made, fun movie.
I don't love her.. She kicked me in the face!!

It does a good job of keep the audience engaged whether through Kale and Ashley's romance or the killer's actions.
No it really doesn't. It's very half assed-ly put together and an insult to viewers' intelligence.