What some people fail to realise is the need to script all segments and matches to fit the time slot of the show and the storyline of the product. If you were to look at several scripts for different shows you would see that some guys follow them down to the last word, some use them as bullet points for a pretty much ad libbed promo, some follow most of the script but change a few things here and there to fit their character, some disregard the script entirely and cut their own promo with the same basic point and some Halls and Nashes get sauced and bury you in a way that is more comical and entertaining than a script could ever be.
As for Edge, it was a good promo, the mapquest line was funny whether it was written for him or not and I'm sure if he had something funnier to add to it he would have. Fact is, the people who write these segments know what they are doing and it is the wrestler's job to put over the angles booked for them, not the other way round. Of course wrestlers are "Scripted to that extent". Its the whole point!