All classes have some form of self healing and all are perfectly viable for playing solo.
From my experience, and especially on the xbox Europe servers, most players are not very social. They just use the group finder tool (which is very easy to use, just takes a while unless you are queued as a healer) to find a dungeon group (the only part of the game where you 'need' to be in a group besides PvP), do the dungeon without talking, then leave and go their separate ways.
All classes have some form of self healing and all are perfectly viable for playing solo.
From my experience, and especially on the xbox Europe servers, most players are not very social. They just use the group finder tool (which is very easy to use, just takes a while unless you are queued as a healer) to find a dungeon group (the only part of the game where you 'need' to be in a group besides PvP), do the dungeon without talking, then leave and go their separate ways.