It's true you don't get to use full capabilities but I find working 1 character bores me to death. I have 4 boxed raids including Labs, Deathtoll, Lyceum and done extremely well. My friend and I do every Heroic instance with just the 2 of us so its great for loot runs and we have a great time. Sure I have to play my characters differently but thats all it is different. My healers are focused strictly on healing with some small debuffs while my wizard and conjuror really focus on damage and my paladin is maxed on survivability. Again maybe I don't use every little skill but it definitely is enjoyable and a different way to play.