Have you tried leveling in Wildstar? Now that's a pain. Leveling in GW2 was very enjoyable until they butchered their talent system even worse than WoW, breaking it completely, the game's unplayable atm.
I still enjoy leveling in WoW, though not as much as I used to before the removal of the old talent system, before the removal of class quests, and before the leveling dungeons and mobs were made as one-shot as they are now. I would like for these things to be fixed, so that I and many others can better enjoy leveling again.
Blizz' free 90 thing is a terrible decision in my opinion, but they probably did it to avoid all the illegal character selling, and to fill Activision's pockets while doing so. Absolutely not an argument against improving leveling though.
You didn't respond to my points 8) - 10) yet.