Totally agree with everyone here.
Gadzooks is right, you can play for for yourself. Log out whenever you want, no nagging ppl begging to stay.
Currently I play with my gf, she has 2 chars, and i have two, so group of 4.It's amazing how fast we kill stuff. Fancy doing an instance, no problem, with 4 it's pretty do-able.

Multiboxing really gives this game a new boost. Still doing it only with 2 of the same class, going to try different classes.