Is it good?
Yes, it's awesome.
Is it technically good?
It makes gore and dirt pretty in a good way.
The acting ranges from serviceable to good - no one is terrible, and that's what matters.
The music and sound are good though a siren is overused.
The director, Fede Alvarez, makes good choices.
What does it promise - and does it deliver?
Scares, dismemberment, gore, and a little wackiness - and oh boy does it deliver.
If you liked these, you'll like this: Evil Dead (1981), Evil Dead 2, Drag Me to Hell, other horror reboots.