Paladins battle more at greater levels not because they're unviable, but wow gold because more classes that may counter them get better. Other folks start gaining gap-closing abilities while the paladin stays comparatively the same speed. The biggest problem for your paladin is a shaman.Shamans are a fairly good counter to them using their Purge and Dispell skills. After shamans start seeing more actions at level 39, paladins have a more difficult time position on equal footing. Paladins continue to be a class that is helpful, just busted by comparison.
Warlocks at this level are like mages. The majority of the 19 warlock's harm will come in Corruption and secondly in the Curse of Agony. The problem for them comes that priests can dispel their DoTs with ease. Considering that priests are a frequent twink class in this level bracket, the warlock will probably be fighting a losing battle if not well protected by his team.
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Life Tapping is harmful, as warlocks at this level don't have quite the survivability because their caster counterparts. Levels are due to more accessibility to spells, of course. But a huge aspect to remember is their dependence on spirit shards. 19 twinks do not have a lot of leeways in regards to expertise. It would be far too easy to accidentally measure the warlock into 20. A great player with proper team assistance could probably pull off some crazy tricks, but they aren't as inherently powerful as the others on this listing.
The exact same cannot be stated for shamans at lesser levels. They're strong healers but lack priests, paladins, and druids' survivability and usefulness. Shamans suffer from weaker DPS than their counterparts and their totems' mana costs. Battleground groups prefer priests and druids.