Been playing Asherons Call and Eq2.Vanguard and some other games but Acherons Call lvl systems is outstanding if ill compare to all other games i have played.
When you begin from lvl 1 you get exp but you spend exp on Attributes/skills from a long list whid every skill in the game .Attributes/skills cost more and more exp for every point and its only possibel to max out a few attributes/skills but its possibel to spend points as you whish.
read more at http://asheron.wikia.com/wiki/Attributes
Is not a multi class sytem and its more fun than exp means nothing more than a lvl up