Knock Outs are just like any other rose in their growth and needs. A rose is a rose whether it is a KO, hybrid tea, climber, old garden rose, miniature or any other type of rose. They all need the same conditions and will benefit from the same good care.
As to why your neighbor's KOs aren't doing well, it could be any number of things, a bad winter, poor care, disease, etc. Roses do not just fail for no reason and do not get too old. I have roses in my yard that are over 60 years old.
If you are looking for easy care roses there are many to chose from but they all will still need all the basic conditions and care, 6 to 8 hours of full sunlight, good soil, enough water ( 1 inch per week), a pruning in the spring and some fertilizer now and then.
My personal favorite for ease of care is Julia Child. It is very disease resistant, winter hardy and blooms a great deal all season. However, if you research easy care roses you will find many more to choose from.
Toni, your rose is lovely but it is not any kind of Knock Out rose I have EVER seen.