You bring up an interesting point -- "why don't all post op results look good or very good?"
The answer, though, is very complex.
First, a surgeon can be compared to a sculptor. He is limited in what he can do by the material with which he works. A sculptor who works with wood cannot do the same work that a sculptor who works in metal or stone can do.
Surgeons deal with live human beings. There are many factors that enter the equation about what can be anticipated as a final result.
Age: As we age, our skin loses elasticity. And it is the innate skin elasticity which will determine the type of procedure which would work for a patient. Large breasts on an older man will almost always require skin excision and nipple elevation of some type. Younger patients, even whose with larger breasts, can often get away without skin excision.
Weight: Being overweight will stretch out skin (and even induce more growth of breast tissue) -- and this weight induced loss of elasticity is a one way street. There is no way to restore elasticity to skin.
Breast size: Obviously, those men with a small amount of gyne are better surgical candidates that those with large or even pendulous breasts.
General health: Healthy individuals will heal better and faster than those with chronic diseases.
The surgeon's skill and expertise in performing gyne surgery: this is obvious. The surgeon should try to remove as much tissue as possible while leaving enough tissue so that the chest skin and fat layer is consistent with the surrounding body. Otherwise, a crater deformity could occur.
Following the surgeon's post op instructions to the "T" this too is obvious.
Major asymmetry is difficult to correct: differences in size, nipple position, etc are difficult to correct with minimal scar surgery. Larger breasts have more stretched out skin, which means that there may be slightly more extra skin on one side than the other once all healing has occurred.
And finally, Mother Nature, which can affect the healing process anywhere along the way, including the production of excess scar tissue. This is under the control of neither the patient nor the surgeon.
It should be obvious, then, that those guys who get the very best results and who heal the fastest are those with moderate sized gyne, who have never been significantly overweight, who are relatively young and who are healthy. It's also a plus if they follow their surgeon's instructions. That's the ideal situation. But not all men fall into this category and most guys would willingly accept a significant improvement (but not perfection) in their chest.
That doesn't mean that everyone else should forget about improvement. As can be seen on some of your photos, many of these men have very significant improvement and although they be overweight or have lax skin, they are undoubtedly pleased with the results.
Some other thoughts. Oftentimes those guys who may not be ideal candidates will then "get with the program" once their major gyne is reduced. Over the years, I have seen some guys really turn it around and build muscle / lose fat and really change their physique (and their lives). Their gyne surgery was just the impetus they needed.
Hope this has provided some insight for you.
Dr Jacobs