The half way point to me felt like 36, I beleave thats when I started killing 70's (some)its been a while I know it was in that range. Once you hit 40 things start to pick up a lot, least it did for me. After the long grind in SM it was nice to get out to the hinterlands and Gagetzan, tons of quests to do. As I hit the 50s I enjoyed old instance content that you would be hard pressed to find a group for otherwise (the old 5 mans). I enjoyed doing those the most so far. I was able to explore and see things I never have before. Now that i'm 65 I kinda wish I hung around a bit more doing the older instances and doing them all. Oh well, guess I'll have my hands full doing all the new instances!