As a one-shotting Arrow Spray ranger with Lone wolf and Raistlin, yeah, I definitely concur with the fact that it's way, way overpowered. Sure, every traps are instant death, but fights are just a matter of when my archer will be in position to hit every foes in view.
In previous builds, Barrage was the level 1 skill and Spray level 3, which was more reasonnable then. And I have the feeling that it wasn't shooting as much arrows as it now does. Right now, it's not an "arrow spray", it's a Gatgling Gun. Especially with crossbows and their absurd damage range barely offset by a higher cost to use - Raistlin makes sure that you've got a very high AP per turn anyway, making a char able to shoot twice even with the level 1 buff active.
There is still a lot to do, balance-wise. I suspect that lowering the damage on ranged weapons ( especially crossbows, seriously, those things deal almost twice as much damage as same level bows ) could be a good starting point. Swapping Barrage and Arrow Spray again, too.
And more visibility on the "interaction" abilities such as Pickpocket/lockpicking/crafting could help. Because then, one may not be as eager to reach higher Way of the Ranger ranks as soon as possible and instead choose to invest in those skills. Well, I did dump points in Crafting and Lockpicking and Loremaster and still was able to mow through foes like a hungry kid through a sugar house, but I guess that more valid choices can lead to more diversity. Or, you know, investing wholeheartedly in a skill to reap benefits at the expense of options. The good old specialization vs versatility.