I never have trouble finding a full server, just don't expect any specialty games like zones or dogfight to be up. most full games are groundpounder games, no hawks. but there is usually at least one semi full server running w/ hawks. just be aware the game is most likely on its last legs and not being supported by the developer. there's still enough active players to make it viable, the question is really how long the servers will be populated.
Yeah those bigger, almost full, servers I mentioned tend to be either TDM or CTF and usually only on the dust or space maps......there is a lack of "variety" by many who host servers.
However, if you keep your eyes open for one of the community's set up servers this wont be a problem......that is IF there is a community style server going .