I did not get Dark Below or House of Wolves until Taken King, and there are old exotics I really want (Queenbreaker's Bow, Radiant Dance Machines, and No Land Beyond to be specific).
How do I get them? Just Crota/PoE grinding or wait for the right legacy engrams? Seems a waste to grind them for just these few rewards.
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House of wolves exotic weapons come from the PoE chest that you need a treasure key for. All of the rest, you can get from doing crota/VoG and from the legacy engrams. Legacy engrams might also be able to give you the 3 house of wolves exotic weapons but I'm not sure.