Rangers with good feat selection will destroy a fighter or barbarian in damage per round for most of their careers. Human variant 5th level ranger: 18 dex (15 start, +1 human, +2 more at 4th), dual wielder feat (variant human). Casts Hunter's Mark every combat. Two-weapon fighting talent. Dual Rapier. Hunter/Hordebreaker. When facing two foes he makes 3 attacks for d8+d6+4 damage and one at d8+d4 damage against the second target - an average of 44.5 damage (excluding misses and crits). If you've played a melee class, you can see that this blows most of the melee classes out of the water. The other classes can't even catch up at 5th level if they use limited resources like frenzy rage, action surge, etc....