I also thought horror would be an easy genre for this, but after scrolling through the last ~50 movies in my watchlist I only managed to find a single one that matched the description: Dark Skies (2013).

47 Meters Down, A Cure for Wellness, A Nightmare on Elm Street (2010 Remake), All the Boys Love Mandy Lane, Blair Witch, Contracted, Creep, Darkness Falls, Devil, Doom, Don't Knock Twice, Eli, Gothika, Hansel & Gretel Witch Hunters, ...

There are many more.

I have no idea what is wrong with my brain, but each of these movies generally entertained me much more than movies with a significantly higher rating on Rotten Tomatoes. But critics give movies like Blair Witch 38 % and Avatar 82 %.

Edit: removed Friday the 13th and Halloween The Curse of Michael Myers because they're pre 2000.

Dolly Dearest (1991). Critically and Viewer panned mainly because it was seen as a Child's Play knock off. It's definitely deserving of a higher rating and it's story is actually very intriguing.

Blue Sunshine (1978). Originally highly rated. New rating from views have dropped its score to less than 50% despite its Cult status.

Body Melt (1994). Another one where the critics are right and the viewers are wrong.

A Bucket of Blood (1959). While it's balanced now. This is a good example of the swinging opinions of viewers. 2 years ago the view rating was much lower, or maybe it was the IMDB rating that was sub 4 stars.

Ebola Syndrome (1996) is the opposite. Originally panned by everyone. It's currently being seen as campy and the rating shot up to 69%. It even supports a Comedy tag, despite no comedy in the movie.

Different person and I keep saying it, but Silent Hill was a really good movie that got horrible reviews (even among Horror fans).