Marginally?
Dominican Republic per-capita GDP: $8,200 (2008 est.)
Haiti per-capita GDP: $1,300 (2008 est.)
That's over 6 times the per-capita GDP. It's not "marginal".
You may be right. My friends who were in DR thought it was very poor (by US standards) and they may have been correct. But when you compare it to Haiti, they may be relatively well off. As I’ve stated, I’m going by second hand info from people who were there over a decade ago.