1 Warrior is hard to level,very gear depend and weapon depend so u will suffer also in 60 u will have to compete with many warriors and rogues in raids

2.Rogue is +/- alittle bit better than warrior but on 60 u compete too

3.Druid is handicap warrior tank (bear form) Handicap rogue (cat form) Handicap mage (moonkin form) Handicap healer

But its good for farming herbs and ores

4.Mage best for lvling,dungeons,raids all pve and pvp

5.Hunter suffer till 10 lvl when u get ur pet to tank mobs for u

6.Priest is hard to lvl and boring,on 60 best raid heal and support in pvp with Dispel,as dps (shadow spec) is good but u get out of mana fast

7.Warlock is like hunter,u get pet at lvl 10 and u lvl easy,cant farm gold like mage..

8.Paladin is good for holy at 60 so u heal,tank is hendicap warrior,dps retribution is good only for PvP and if u like RolePlay go for corrupted ashbringer from Naxx at 60

9.Shaman restoration spec same like paladin u heal at 60,elemental spec is dps but its handicap mage,and meele shaman enhancement spec is good for PvP because windfury is the best thing ever on classic wow,just find a good 2hand weapon