Best damage in this order
Ranged: Hunter
Melee: Rogue
Melee: Warrior
Magic: Mage
Magic: Druid
Melee: Pally
Top Ranked healers in order.
Priest
Druid
Pally
Shammy
Top rank FC
Druids (Travel form)
Pally (Self heal)
Warrior
Rogue (Sprint)
Sub-par classes
Warlock
Shammy
All in all every class has a place in the 19 bracket.
Warlocks should generally be around the top damage in a full game and are far from sub-par. You can quite easily out-play most hunters. Shamans are also very strong and have great mobility, utility and should be able to beat most other melee classes 1v1.
Hunters are very overplayed, and whilst they're very powerful if you can play them well, they are very easy to play badly. People think they are overpowered because most bad hunters sit in mid together and farm kills, and its very hard to fight 3 hunters in mid at once with limited ability to LoS them, no matter how bad they are. You'll also find that there's a fair amount of general hostility towards such hunters in the community.
Really you should just play a class with a playstyle you enjoy because every class can be viable at 19.
Best damage in this order
Ranged: Hunter
Melee: Rogue
Melee: Warrior
Magic: Mage
Magic: Druid
Melee: Pally
Top Ranked healers in order.
Priest
Druid
Pally
Shammy
Top rank FC
Druids (Travel form)
Pally (Self heal)
Warrior
Rogue (Sprint)
Sub-par classes
Warlock
Shammy
All in all every class has a place in the 19 bracket.
This guy is either trolling or has never played 19s seriosuly.
Best dps:
-Hunter (strongest dps in wsg and as previously said overly played cause even a badly played one is able to kill better players in wsg)
-Warlock, Warrior (best dps classes after hunt for wsg)
-Mage (mage is very strong at 19, but the overpopulation of hunters makes it a bit worse, btw one of the best classes for arena if you care about that)
-Rogue, Retri (both meles with no snares in a braket dominated by hunters)
Best heal
-Shaman, Priest (both provide good heal and utility)
-Holy pala, Druid (playable but worse than sham/pri)
Druid is overall just played as FC, as it is the best FC class, Pala would be second. Mage can also be played as full cc class in Offense / Defense scenarios, being the best class to support kitting defenses.
If anyone tells you that rogue is better than warr or lock at 19, they dont know **** about the braket.