I've done every class up to level 20.
Burg is kinda slow at first until you get more cc, debuffs, and attacks.
RK is really slow in the very beginning. You only have 2 attacks and light armor, but by level 20 you're killing things in 2-3 hits from range
LM was a lot to wrap my head around at the beginning as well. I still haven't really got going with the class, but I'm guessing that's a problem with me, not the class.
[B]Dwarrowdelf[/B]: Gufli-Champ(58), Gadhalion-Hunter(27), Galbarad-Warrden(23), Gildro-Burg(20)
[B]Windfola[/B]: Fredemond-Mini(25), Fimorin-Cappy(34), Fallaf-Guard(25), Fumli-RK(25), Falandion-LM(21)