Logically, there seems no reason there would be any difference between Magnums and regular bottlings in regards to any `threat` obtaining a `bad` bottle. Personally, I enjoy larger formats several times for the following reasons:
They typically age slower in the larger format.
They serve well for larger groups.
Are fun to present at a celebration or gathering.
I enjoy collecting them
They can often bring a higher price at resale, should you ever decide to do so.