- Make Outland, Northrend, Cataclysm, Pandaria and Draenor scale from 60-100. From Cataclysm and onward there is a massive jump in quest design quality. There are actual storylines that span the whole zone and culminate in epic showdowns (Ragnaros in Hyjal for example). Unfortunately The best zones get shafted because Outland and Northrend hog up whole 20 levels. I think everyone would much rather complete all of Draenor and Pandaria instead of slogging through Northrend and collecting frozen bear guts. The only thing that Northrend has going for it is cool atmosphere, the quests themselves are atrociously dated by modern standards. That's not to say people should be prevented from questing in Northrend if they want to. Just give people the option to spend more time in more recent zones while leveling.
- Retune Outland and Northrend quests. Those zones feel like they were designed by someone having a bad day at work. In Zul'Drak you have to collect 16 low drop rate items just for one quest. In Pandaria the same "collect x" quest would have you dispatch just 6-8 mobs with 100% drops and be done with it. And that's just one quest. Another has you control slow-moving ghouls to haul Scourge poop. Then there's a whole quest chain that rewards ZERO experience. That's right, none of the troll patrol quests have XP rewards but you have to complete them anyway to move on to other quests. Outland and Northrend have dozens upon dozens of tedious unrewarding quests. The whole Fizzcrank Airstrip questline in Borean Tundra is worse than stepping on legos.
Revamping Outland and Northrend quests would take too much effort but at the very least they could be brought in line with Pandaria and Draenor quests. Reduce kill requirements to 6-8 mobs max. Make "collect x" quests have 100% drop rates. Make escort quests complete instantly like in Pandaria instead of having to slog behind a slow moving mob for 20 minutes. Implement MoP and WoD technology so that you get follow ups in the field instead of having to run back to town. Increase mob concentration so that you don't have to hunt for a needle in a haystack. And for God's sake make breadcrumb quests reward full XP like in MoP and WoD.- Improve dungeon rewards. Making dungeons more difficult is a step in the right direction. Making them reward less XP than questing is not. Rewards have to be brought in line so that running dungeons is an acceptable alternative to questing. Group content should be more rewarding than solo play, not less.
- Nerf mob HP, increase mob damage. Fighting through legions of punching bags = not fun. Fighting mobs that will punish you for messing up = fun.
Leveling 60-80 right now sucks because of Outland and Northrend. You have to slog through the most outdated zones in the whole game for whole 20 levels.