The only big difference in The Dark Below was the raid, a 3 exotics and 3 timed exclusive (to DLC) crucible maps.
House of Wolves had PoE, 3 exotics and Trials, and 4 crucible maps that might be timed exclusive to this DLC as well.
That's not that big of a difference considering all the changes they made to the game.
[spoiler]strikes and story missions were no a big deal[/spoiler]
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And trials is one of the most rewarding things in game.
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I'd say its the only thing. Everything else was disappointing.