Well, my point of view is ET is not a bad tool by itself, but maybe it shouldn't be available for unexperimented users. ET doesn't have to be used in every situation, and must be used carefully when needed.
People who just use it to "hack" ot "cheat" like you say haven't understood anything about the Waze concept.
By the way, even if the map is pretty good now, there are still a lot of things to improve. This kind of tool can be usefull in some situations.

