I enjoyed Caen from the original DOD. I can't tell if this version is actually bigger or if I just can't remember how big the original one was. I agree though that the source version has a full server to be really fun.
I noticed that after the Palermo patch there were a lot of changes to the server like player clipping was turned off and submachine guns were more accurate and a lot of level objects were enabled. How many of these things were a result of the patch and how many were server configured things...