No, I think that Sauron Swarm/ Wounding is, as it stands, a viable and good Deck. I play Sauron Wounding by myself, and I once tried to play with 4
Forces of Mordor, but it's just way to good. It's beyond each power, it adds massive amounts of Twilight without any Drawback. I managed to get 2 one Site 2 and got an instant kill, being able to play all of my minions.
Some cards that abuse it in particular:
Morgul Skirmisher (maybe not the best, but still, exhausting a hobbit or two and then finish him off with
Hate really can be a big deal.)
Seeking Its Master (can do massive amounts of card drawing which often leads to victory.)
Band of the Eye (make him discard a lot of cards.
Strength Born of Fear (this card sucks, but you get the point.)
Those are the Sauron cards that take advantage of the Twilight-adding-thing, not considering other cultures though (you could easily splash
Attea, Keeper of Dol Guldur just to have a 17 strength fierce minion or any other minion, I could even see a combination of Moria and Sauron wounding being fueled by
Forces of Mordor).
The main problem is: No matter what, the card is gonna be played in each Sauron Deck at least 3 times and would make massive blowouts, especially considering there is no rule of 4 in the Shadow Phase for making all these draw-cards happen.