You just can't make a complete party by yourself. It's fine for quests, battlegrounds, arena with partner, whatever. Spec one resto and make friends with a tank, and you're back doing 5-man dungeons (and with fewer things to concentrate on). It is what it is. Plenty of people only do 2, 3, or 4 accounts. Hell, if you had to max out to be any good, only Prepared and Sam would get to have any fun. Do what you want, can, and enjoy - it's a hobby.