Question: In considering issues such as scientology for human cloning, disease-free DNA, agelessness and physical attributes such as personality, build and complexion; the question is, "what would the perfect human race be like and how would they be mass produced/reproduced?"

Answer: 
In reviewing comments above, I believe that Star Trek is the greatest science fiction universe ever; however they clearly are flawed. If they weren't it would be a boring show. As for a "perfect" race short of Q, one must consider that they too will have disadvantages but would co-exist with each other and their planetary system symbiotically. 

This would first require either an intelligence capable of creating the delicate balance of population growth and consumption of material, or a lack of sophistication to the point of minimal population growth (aka, death and birth rates relatively even) and global impact.

In either scenario my own supposition requires peace, and so they would need to have a deeply shared moral code. I would consider the following virtues to be required: compassion, courage, empathy, being equanimous (ability to maintain composure), forgiveness, being humble, honesty, a sense of justice, patience, prudence, temperance, and tolerance.

As for physical being I keep thinking of water bears, which are already near perfect. Low metabolism with minimal hunger and health impact, disease and bacteria resistant, also water bears incorporate DNA of other organisms into themselves to improve upon their resistance. 

If we're talking humans then think Superman's personality, Wolverine's health, Bruce Wayne's or Captain America's sense of civic responsibility, and Lex Luther's intelligence.

The rest can be extremely subjective based on personal aesthetics.
What they would be like would be pretty relative and opinionated. What my perfect human being may be, would probably not be your perfect human being. We can consider what globally would be desirable such as disease-free and ageless but that is basically where the buck stops. 

Physical looks is highly opinionated based on regional tastes. To the Asians, the fairer the skin, the more "wealthy" you are and beautiful. People who are tanned would be considered poor people who work in the fields and undesired. Inversely, people in American society love a tanned look. Being tanned shows that you have the money and disposable income to work on looks, go outside and tan instead of work. Take a vacation to a beach. Tanned is considered attractive because it shows they are outdoorsy and athletic. Being athletic though isn't entirely desirable in terms of physical traits by everyone either. Some cultures think that a plump person is beautiful or at least it shows status of having money to provide food and eat where as someone who lacks money, may not be as well fed.

Ultimately there are just too many factors to create a perfect human race that appeases to every culture. You would be better off creating a sentient being who is a humanoid that started out as a collective conscious similar to that of the Borg in Star Trek. This then eliminates the difference of opinions and culture as they are then assimilated into 1 mind and then assimilate others to improve their intellectual property. 

If you were to take Earth though, and try to force this perfect being, socially, it just would not be possible as no one would be able to agree about every aspect of what would be perfect.

**EDIT:** Possible solution to appease the situation.....Create a human that cannot die to to sickness, and cannot be born with mental or physical issues. That solves the first issue. Once you have those things eliminated out of the way, you can turn Birthing into a selection process. A couple goes to a Facility that states what they want in their child. Looks, smarts, athletics, what ever it is they hope for their child. You could either have this be a clone creation or have it so that the parents' seeds would be used. So the mother's egg and the Father's sperm would be used and modified to create desired results. This then takes away the cultural issues and any difference of opinions based on societal taste as it allows for each person to customize their child using the base template of a perfect human that cannot die unless by murder.