My dwarven miner stated above had +3 enchantments on both his picks which began to become useless compared to the barbarian with the two handed sword.
"Useless compared to the barbarian"?
Are you implying that the damage disparity became too great? Because even at second level any barbarian with a 2-hander will both hit more often and out-damage a dual-wielding ranger.
Skill-wise? Depends on the skills you picked.
If you're referring entirely to fighting creatures that have DR which your party has no way of overcoming, I wouldn't consider that 'useless', but 'situationally impaired' with a fix of 'find a way to overcome DR'.
On topic, I prefer levels 1-8 as I feel its easiest to suspend your disbelief (although I realize its all a fantasy game).