Druid:
-Very Fast leveler.
-Least played class in Classic Wow which makes it very easy to find groups.
-High skill ceiling makes great druids really stand out.
-Most mana efficient heal in the game(Rank 4 healing touch).
-Rebirth and innervate is among the best raid cooldowns in the game.
-Ton of useful utility with crowd controls, buffs and the ability to off tank if the tank dies.
-Shapeshifting makes them incredibly slippery in PvP
-Best flag carrier in Warsong Gulch by far.
-Feral druids are great tanks for dungeons, especially during leveling
-Very strong in PvP against classes with bad self-sustain.
Hunter:
-Best leveling class in the game.
-Incredible at doing solo content such as farming elites or gold.
-Going out and taming your very own pet is really cool and unique.
-A ton of different pets to choose from which creates a lot of variety.
-The pet system has a lot of depth and is almost its very own meta game.
-Easy to learn, hard to master.
-A good hunter is a devestating foe in all types of PvP.
-Bring a lot of useful crowd controls, buffs and effects to the group.
-Has a unique class specific quest at level 60 that rewards you with epic weapons and a quiver.
-Has a lot of depth to the class with pets, deadzone, stutterstepping, etc.
Mage:
-Top tier damage dealers in both PvE and PvP.
-Is able to farm gold & level very well through Area-of-effect damage and slow abilities.
-Being able to make your own food and drinks is convenient and a huge money saver.
-Can conjure portals to capital cities which is really great with traveling being so slow in Classic WoW.
-All 3 specializations are viable.
-Brings a lot of crowd control and utility to the group.
-Can make extra money off of portals and drinks.
-High skill-ceiling in PvP that allows you to really stand out.
-Strong in every aspect of PvP and PvE.
Paladin:
-Fantastic healers in both PvE and PvP.
-Free mount at level 40 and a cheaper epic mount at 60 through an epic(though costly) class questline.
-Incredibly desired class due to their incredible buffs & support toolkit.
-Very resilient and hard to kill in PvP and PvE.
-Very easy to learn for beginners.
-3 very different specializations.
-Being faction-specific is cool.
-Retribution can be great in PvP, especially versus melees.
-Protection makes for excellent tanks in dungeons if you know what you are doing.
Priest:
-Top tier healers in every type of PvE Content.
-Shadow is incredibly powerful in PvP, especially in one-on-one situations.
-Everyone wants a healer priest in their group.
-Priests have race-specific abilities that add a lot of nuances (see them in the ”Spells & Talents section”).
-Pretty effective levelers once you get a wand.
-Mind control is one of the most fun abilities in the game for world PvP.
-Priests gets a cool class-specific quest that tests your skills as a priest and rewards you with an epic staff(Benediction/Anathema).
-Has by far the most healing/support abilities, making it the most engaging healer in PvE.
Rogue:
-S tier in both PvE and PvP.
-Best world PvP class in the game.
-Stealth is incredibly useful and a big advantage over other classes.
-Incredibly powerful cooldowns.
-Useful utility with sap, blind, and even the ability to temporarily tank with evasion.
-Pretty easy to play well but has a high skill cap.
-Able to open up locked doors that would otherwise require a key.
-Scale really well with gear but isn’t weak without it.
Shaman:
-Fantastic area-of-effect healers due to chain heal and totems.
-Ghost wolf at level 20 really help speed up leveling & traversing in general.
-Only class with a ranged DPS, melee DPS and a healer specialization that are all viable in PvP.
-Both elemental & enhancement shamans can do some ridiculous things in PvP with their insane burst.
-Good levelers.
-Brings an insane amounts of buffs and utility to a group with their totems.
-Being faction specific is cool.
-Windfury & windfury totem is one of the most fun buffs in the game.
-Have almost no competition on gear.
Warlock:
-Absolute monsters in PvP with multiple viable specializations.
-Excellent levelers.
-Free mount at level 40 and a cheaper epic mount at 60 through an epic class questline.
-Brings some of the most useful utility in the game with soulstones, healthstones, and summons.
-Incredibly tough to kill, despite wearing cloth.
-A vast array of cool demons to control.
-Scales really well over the phases and becomes one of the best DPS’ers later in Vanilla, despite of the debuff limit.
-All three specializations are pretty different from one another, despite all being damage focused.
-Some of the most fun niche abilities with ritual of doom, inferno, etc..
Warrior:
-Exceptional damage dealers in all types of content.
-Unstoppable in PvP with a healer behind them. (almost)
-By far the best tanks in the game, especially in raids.
-Can wield all the coolest weapons in the game.
-Very high skill cap due to their unique ‘stance’ mechanic.
-Very sought after in all types of group content, both PvE and PvP.
-3 viable specializations.