I, like you find the hints very helpful to my research. I also try to spend the time to make sure they are appropriate to my ancestors.
My approach is that I only make modifications directly to my FTM data - not to Ancestry.com. In other words, I only upload from FTM to Ancestry. For the most part, I use the hints in FTM, but periodically look at Ancestry hints, then go to FTM to finalize research and update if data from FTM if it is valid. The reason I do this is because I may use multiple sources to validate the data; ie, FamilySearch.org, google, or some library research.
I know it is a pain in that the two hint sources are not synced, but, it is a heck of a lot better than not having any at all. My thoughts only, but seems to work for me.