well i started to play mir3 ago 3 days and i can say
warr - strong class , tank
ass - pretty crap at powerfull attacks ( when he is attacked) u need alot of patience and to lvl alot him to get at a stage where u can do rly cool things , its a very tricky and hard class
wizz - usualy lurer , hes abit strange with all that elemients ( fire ice wind...) he confuse me , to much spells =P
tao - good class , pretty same as mir2 . just that is more good on solo lvl then mir2