Let's see the first time I hit 40 with my human paladin, then turned around and did it in half the time with a human Warlock. Or the creation of my twink hunter, back when Battlegrounds were fun and using "The Rake" as a pet to crush the other team.
I would make a night elf druid, a Tauren druid, or a shaman, since those were both classes I wanted to make but never got the time.