Dominican Republic has always been difficult, there is a huge amount of poverty and trouble. , more so than other Caribbean islands and a lot of staff and people from Haiti there too, which has its own problems and who bring those problems with them.
I wouldn't be scared to go, but I'd accept it's cheaper for a reason, and stay within the confines of the resort or on organised tours.
When we were there one dickhead member of staff told us white people were referred to as tampons, basically staff had disdain for the white guests, whilst acting professionally.
We had a good time, I wouldn't be scared to go, but quite frankly we would not go back. We didn't find it a pleasant place to be.
It's really not like going to St Lucia, Barbados or Antigua etc, but the price reflects this usually.