Near me Google maps displays a road that has been removed in 2008. When I found that out earlier last year, I used exactly this feature to suggest a removal. As of now, the road is still on Google Maps and the only response I've ever gotten was the automated email reply.
As a counter anecdote I marked a road as changed (one end was closed off) and it was fixed in a few days. I have made quite a number of edits to Maps so to me this is not at all what I have experienced. Maybe Google is different (IE. worse)) in the US than Scandinavia.
It's very variable for each edit. I've sent about 20 edits over time, all in western Europe; some were accepted rapidly, some were rejected for some reason, some are still stuck in review after months or years.
Even in the same area. A neighborhood name was added, but the street name change in that same neighborhood wasn't.
