When it it comes to Hip Hop NWA is easily the most influential group, and I don't see another group coming close to what they did as far as influence, plus it was so organic, and everything now seems kind of forced.
NWA is arguably one of the greatest rap groups of all time, and if they aren't the greatest then they have easily had the greatest influence in hip hop.
Its doesn't matter how old you are, what race/color you are.
If you are a true hiphop fan, when asked 'Who are your favorite hiphop groups or rappers?'
NWA, Ice Cube, Dr. Dre, or someone affiliated with that group has to be somewhere on that list. NWA is probably one best groups ever to touch the mic.