Hunter skills and how much damage bonus do they really add??

[Sirak]

At different LOTRO sites in the internet the amount of damage-bonus a special attack skill vary dramatically.
For example for "Merciful rejoinder" I can find Main Hand + 4 up to +28 damage
Especially on the lotro.wiki.com page all the bonus seem to be very low (I mean for a lvl 24 skill, which requires additionally a parry, like merciful rejoiner a +4 bonus means nothing, not even 10%).
Why this differences as most of the pages have "in-game" pictures showing the description of a certain skill?

[Ydyp]

Your skills grow when you level up. So first time you get the skill it can have a bonus of +4 and at level 50 for example have a +28.

Now as you are a hunter you are more proficient with ranged then melee, our melee attacks can finish of a mob that reached you after you pumped it full with arrows. Most of the mobs even die before they even get in range to melee.

[Sirak]

is it +1 damage per lvl? have to look next time I gain one.

[Stigmata89]

At lvl 43

Quickshot+17
Swift Bow+82
Barbed Arrow+12
Penetration Shot+95
Merciful shot+288
Rain of Arrows +83