These are my thoughts on leveling in 7.3.5 please feel free to reply with your experiences and whether you agree with my last point.
So, after the patch hit I decided to level a new Alt to get a feel for the zone scaling for my soon to be Void Elf.
As I would probably use them on the Velf I used my full Heirloom set (- the ring) giving me a 45% xp increase and a few trinkets and neck items to help with downtime. My zone progression was, Dun Morogh > Loch Modan > Wetlands > Arathi Highlands > The Hinterlands > Western Plaguelands > Eastern Plaguelands > Burning Steeps > Redridge Mountains.
Up until Western Plaguelands it felt pretty cohesive as a progressive storyline and questing goes for a typical Dwarf, with Burning Steeps and Redridge being a bit of an oddity too get me to 60.
Now to be honest everything progressed smoothly most zones gave me roughly 5-6 levels after Loch Modan which I left around level 23-24 and I hit 60 pretty easily after the 9 zones. I made a point to get the questing achievement for each zone to help towards my Loremaster and did the odd dungeon when it felt right in the story.
However, for a new player who is fresh in the game to reach level 60 that’s another 45% worth of xp needed, pushing my 9 zones completed to 12-13 + id imagine as a new player that I would feel a bit overwhelming and disheartening that after completing the best part of an entire content I was only half way to max level and hadn’t reached the first expansion yet.
I can understand why so many people are angry that it takes too long to level, using heirlooms feels to me what base leveling should be.
I would like to suggest a XP bump 20-30% should to it and the scaled zones would take care of the rest.
With Heirlooms I think 7 zones in classic should be enough to hit 60 without feeling too slow, finishing my story at around the Western Plaguelands sounds about right, as it was here I started to feel a bit burnt out.
Posted this on the official forums as well but wanted to see what the MMO-Champion community thinks as well.