The most unbalanced part of the game is the difference between any non-legend char and a legend 20th rank character.
This isnt a problem, especially as the playerbase thins out over the course of a wipe. however;the advantage given to groups who get to zones first after a pwipe is a problem imho.
Usually getting out front of the pack will get you to level 30 faster, but more importantly, it gets you an 18 or 19
rank advantage, because all the levelling zones had fresh ranks for being the zoning frontrunner.
A simple solution would be to make acculmulation of rank % begin after level 30 has been attained, or perhaps some other mud event happens like Cyan or Soth killed.