The reviews aren’t terrible overall, it ends up with three stars which is very close to what Simplisafe and most other low-cost security systems get.
The bad reviews are mostly from people who are either outside the United States and didn’t realize it wouldn’t work for them or who expected more coordination with the home automation side.
You can certainly argue that that’s a failure of the marketing and product descriptions, but it’s not a failure of the product itself.
The only low-cost home security system I saw which gets significantly higher reviews is ring alarm and I think that’s because It’s noticeably lower cost than the other systems and people feel good about that so they cut some slack, and because its advertising is more reflective of what the system actually does.
The following discussion is for people who already have the system installed, so you might want to take a look at that and see what their experiences have been.
New ADT partnership, new touchscreen hub and devices (discussion thread)