Well I haven't played runescape for about a month now, but I think pvp was ok, but ya they shouldn't have taken the old pk away. They could have made it certain worlds so people could do stuff in the wilderness like kill green dragons or clue scrolls, but they didn't have to take it away. A good thing about pvp is that you can respawn right near fighting if you're doing it for training. Overall I think it was a decent replacement for the old wilderness, but nothing so far has completely filled its spot.
Personally i like the new Pvp, i havent got round to actually properly pking yet... but i did like the Oldschool pking system better, BH does Blow.. Big style.. but im happy that they have actually brought it back, kind off.