Naruto's suffering is designed so it can be overcome. People like Sausage are supposed to be consumed by their shit lives. I just can't stand when a character shows that they are more than capable of moving past their issues, only to turn back and willingly accept their predicament.
It's not whining until you prostitute your ideals to accept your suffering. Nagato had a horrible life, but his outlook was determined by the events that preceded Yahiko's death. He actually wanted to attain peace the right way, and got burned for it. Sasuke is more of the same, but he showed he could get past this multiple times.
Naruto getting past his issues is somewhat isolated. The things that plagued him didn't really involve specific parties. It's no less difficult to overcome, but I will say once the first few steps were made, his road to recovery was much more stable.
And I'd like to add Naruto slipped into his circumstance quite a few times. He's proven that without the support around him, he could easily be a Sasuke, or a Gaara, or even a Madara.
