[quote=@Darkmatter]
<Snipped quote by The Darklight Project>

Ya I've been doing some of the older stuff and really enjoying it even if the loot drops that are worth it are few and far between! Everyone says the real good stuff is only in raids! So I'm really looking for a group to start doing those with.
[/quote]

It's also a good way to level up your subclasses. You don't NEED to do them all.... but I'd recommend it. Apparently they've updated the main storyline to be coherent, so I'm planning on doing it again eventually. Also, for the House of Wolves and Dark Below quests, you'll get some valuable faction reputation with a few different in-game vendors, which is worth your time in the end (you get lots of free goodies, and access to lots of nice-but-expensive purchasable goodies, for raising your reputation). 

All in all, worth it, IMO. To really understand Taken King, you should at least do the Dark Below content first -- that's the instigating event for the whole new story.