You can help 'improve' the wanderlust maps by sending in your tracks to smellybiker ..
There are 'free' maps ... but they will need work from you to get them going ..
Probably less accuracy than wanderlust?
Peoples tracks ..
On 'world maps' and there detail, use ..
if you bought a paper world map .. what could you expect on that? The GPS 'world map's are a lot better than the paper versions...
And before you buy it you can look at the sample for free and judge what level of detail is avalible. Set your mapsource program to detail - 'highest' and zoom in to 700metres ... sorry I'm metric here. You can use the find function to see what is avalible in POIs if you don't want to zoom in ...