Hearthpwn

Pain Warlock can fairly consistently get a very strong board by turn 4-6 and can be too much for them to deal with. Make good decisions with the order you play things in and you can roll over paladin and druid. If you draw badly or mess up with what you play and when or they get really good early draw then they can take full control but it's such a fast, aggressive, value generating deck that they don't build up enough steam. 

I've played paladin less than druid so still need to see how it goes as part of a larger sample but it's gotten to the point where if I come up against druid then I'm pretty comfortable that they will lose. The ramp just kills them because it's too slow.