Getting rating isnt character progression, its a measure how much you have played arena trough out that season and how far you have gotten and its more of a rating of your skill to manage your characters ability with your team to defeat the enemy team....
And in prestige they are removing the fact that when you reset you dont lose your talents so its basically a passive grind that you and your grandmother can get eventually which is really boring.
Hopefully every dragonslayer out there is happy for a fact that they removed a part of the game which was important for many players who wanted to progress their characters trough PvP! And if you say pvp was a way of getting easy gear for "raids" that there were too many "noobs" playing "Our hard dragon npc encounter", then dont be on a group that has a leader who invites people with full pvp gear, simple as.