I've only had 2 angies, and I really liked both :-). I have 2 planted out and will be trialing them myself.
I think the thing to keep in mind is that Dr Campbell's growing conditions are very different from 99% of the rest of the south florida mango growing population -- dade rockland soil with whatever micronutrients were left behind from decades worth of tending an avocado orchard, zero nitrogen, and loads of potassium. So, I think he may be selecting mangoes based on how well they perform under his unique growing conditions.
That said, I don't think there exists a mango which will always be perceived as excellent. Not only is mango quality typically variable due to climatic variation, but our perception of mango quality changes as we a) get bored of a particular flavor, or b) find subtle qualities which were not previously noticed.
The best bet is to halt the search for the non-existent HGM (Holy Grail Mango) and plant a few really good ones. Then realize (and be content with the fact) that not all will be perceived as having excellent quality on a given year, but there will be enough "excellent" ones to make it an enjoyable mango year.
And, it's human nature to always be noticing greener pastures, regardless of how green one's own fields are. (Look at folks like Tiger Woods who, while married to a professional model, are checking out other ladies.) It's best is to stop chasing the carrot / HGM and be content with "good enough."
:-)