Most people consider “hardcore” PVP to be free for all, full loot PVP and to the purists anything less is “carebear”. “Realm vs Realm”, as coined in Dark Age of Camelot, is considered to be PVP’s friendly cousin. It's PVP with a focus on realm/faction wide co-operation. The very fabric of RVR goes against the very nature of hardcore PVP but words and their meanings are not stagnant. Is RVR in Camelot Unchained more hardcore than hardcore PVP?
Read more of Timothy Eisenzimmer's Camelot Unchained: Hardcore RvR.