I sure wouldn't want it for mods of Gb size.

The discussion was started in a GRAW2 PC feature topic and suddenly sounded like the most important feature to add, and that it was something that should have been in the game from the beginning, and that it was incomplete without it and all that.
In that case it's multiple smaller mods on a server though, not one big sucker. Well, it's up to the servers in GRAW2 actually. They can package their maps as they want.
I feel it's a nice feature but not something essential to a game as I am capable to browse the web and visit the server webpage to get the mods they are using, and put them into my game before I join the server.