Yes it is very fun to do it with a few people. bigkab & I defended an empty server all by ourselves. He took the dock & I took the beach. When there are only a few people they only attack near where you are. They do not pop up from any other barricades like on the busy servers. I find the siege charges to be my best friend. I had 126 kills & got 3300+ rep. Works better with 4 people (2 on each side) that way you can run & get ammo & heal each other if needed.
JI