Speaking for myself there are a few other deficiencies:
Inablity to input house number other than as a range ( and not always even that). With a long road you can find yourself a considerable distance from where you want to be.
Never tried this!
Late instructions ( maybe peculiar to my car).
Perfectly timed for me.
Slow route recalculation when a turn is missed.
Has always been in time for the next instruction!
Out of date mapping, roads several years old missing from 2007 / 2008 disc.
Agreed
Inability to input my own POI.
Not something I've ever felt inclined to do.
Not touch screen and messy user interface.
True, get yourself Linguatronic and use voice commands
Ludicrous price of updated disc.
Much less than a £ a day!
IMHO a pretty poor system.
But as crockers says, it's more than just a sat nav! Each to his own