When I got married my wife made me agree to not play those divorce inducing MMO's. Three years later she suggested we try WoW and justified it saying, "We could play it together." This led to spending hundreds of hours of exploring Azeroth together and an extra year in school.

WoW allowed us to play toons together as well as separate. When SWTOR came out we started a new MMO with some excitement which soon turned to frustration. The game was designed to either play solo or play in a group in a dungeon or PVP

Even game media sources seem to put questing into solo category and group playing in dungeons and PVP. Is questing consistently with a friend something unique? Do you have a friend you regularly quest and world explore with?