I have not use them for over a year so it's conceivable that things have changed.
Spoiled by success?
I have used this service more than 20 times for very VERY good work. The few times it wasn't up to par, I would get a refund.
The only way I can explain so many bad reviews is that buyers were not careful and so got connected to bad providers.
Nevertheless use common sense and you will more than likely also end up wanting to write a good review.