Are there any decent MMORPS's with a single player mode?
You can get to max level without grouping in like WoW. Maybe Star Wars, not sure. It's story focused. In FFXIV you will have to group to go through the story and unlock more features. There's a duty finder you can queue in that will automatically put you in a group, so you don't have to worry about finding your own. But yes, you will have to join groups.
River Song: Well, I was off to this gay gypsy bar mitzvah for the disabled when I thought 'Gosh, the Third Reich's a bit rubbish, I think i'll kill the Fuhrer'
if you know your role in dungeons and play a dps class, which means you don't have much responsibilty, you can just pretend like the other players are just npcs if that really bothers you. the game never forces you to talk with other people anyway. just do your job well and everything will be fine. with all the grinders in the game now most people don't seem to talk anymore anyways, probably to not slow down their speedrun