No, you should know the people on your server. Cross server stuff is what killed WoW's "great" community, not dungeon finder. People have a bad from people on another server, you can't do anything but complain/ be rude to people on your server which in turn creates a bad community. Love of God do not do a cross server.
Edit*
Lower levels get tenacity so a level 10 can still kill a bad 50.