You don't need the -e ssh
(unless you're using a really really ancient version of rsync) - ssh is the default.
For dry run:
rsync -avn user@server.com:/directory/ /local_directory/
For actual sync:
rsync -av user@server.com:/directory/ /local_directory/
Also note the trailing /
s - otherwise you can end up with /local_directory/local_directory
etc.