In the actual Gundam SEED series, including Destiny, there was never a lengthy explination of what the DRAGOON system was. If you were to just watch the episodes alone and not dig around on the internet (even though it doesnt take much digging), you would have no clue what the DRAGOON system was, aside from maybe vaguely understanding that it had something to do with the gunbarrels/pods.

Edit: This is also why I don't think Kira's newtype flash will mean as much to the newer Gundam fans, since the newtype ability hasn't really been explained in SEED.