i didn't really have any expectations going into TDB. considering the state of the game at launch, i knew there was no way they'd have time to make meaningful changes to their first DLC.
House of Wolves is different, especially if it was really delayed. They've had plenty of time to design the raid, queen bounties, pvp maps (especially the vehicle ones using feedback from the first 3) and exotic gear. There's supposed to be a new social space as well, right?
There are plenty of reasons to be hyped. Whether it ends up being amazing is one thing, but the boom that The Dark Below brought to the game will surely be eclipsed if House of Wolves is at least on the same level.
But this is Destiny we're talking about. Even if it sucks, people will still grind for the loot.