Getting to 600 is easy if you're smart and efficient with leveling. Also didn't use the Prime Engram Exploit. Just did all the weekly challenges in the right order, started second character in week 2, third in week 3, and figured out the most efficient order to complete things. It's really not that hard or time consuming if you're smart about it. Don't get me wrong it would have been cool to get some Forsaken exotics on my grind, but I'm not all that put off about still having a reason to play while I'm getting through end game stuff.