Why Are Acne Scar Treatments Not Effective?

From what I understand, the most aggressive treatment out right now is Fraxel Repair. After doing some researching and reading a ton of reviews, it seems it's either hit or miss.

I have also read reviews where some people have gone through many different types of treatments ranging from Laser Resurfacing, Dermabrasion, subsicions, other various types of laser treatments.

With little to no improvement. Knowing that acne scarring can only be improved, and from the looks of it, either hit or miss, is quite disheartening. A rough estimate is yielding about 1/5 patients satisfied with their scar treatment. Your opinions

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