Personally I love being completely decked out in PvP gear in battlegrounds being able to absolutely destroy people in 3-4 seconds. On the flip side I also love going in as a freshly dinged soon, struggling to make a difference and keep up, only to improve bit by bit in each battleground, ultimately to have a strong character that can contest objectives. The entire progression in battlegrounds is what made them fun for me.
Arena is a different story but not far off, if you had a full set of battleground gear you could easily contest players at a 1800-2000 rating, then when it improved you could hit 2200+.
All in all the new system doesn't interest me in the slightest, I have 0 drive to queue for BGs or Arena at the moment