Are you serious? Level 10 and 21 (not sure how high it can go but I saw 21 with me in a PVP battle..Seriously?
One of the best features in this game IMO. It actually goes level 1 to 50, but you really don't belong on the battlefield if you have yet to pick an advanced class.
But I can take my level It doesn't matter and group up with my buddy with a level it doesn't matter character, and we can go have fun together in warzones.
Also, I have noticed serious problem with being able to keep up with people who are higher level. Absolutely great. People who have PVP in the blood don't want to be forced to go through the whole game in PVE before they can just sit back and enjoy some PVP. Fighting twinks every 10 levels doesn't count.