I am the Mouth of Sauron.

[The Might]

Originally Posted by The 1,000 Reader

I see the Mouth of Sauron as I see Sauron in the First Age.

Fancy rank, not much else.

I don't agree.
Sauron was indeed only mentioned a few times in the Silmarillion, but this does not mean that he did not play quite an important part. The same kind of logic is used by many to show that Glaurung is stronger then Ancalagon for example, but just because a character is mentioned more or less in a story doesn't mean that he didn't play a very important role in the events that took place.
He is only mentioned as the one that controlled Tol Sirion and in context with the events that led to the Quenta Silmarillion. Again, in the Quenta Silmarillion during his duel with Huan, and lastly as he repents after the War of Wrath.
Still, it is stated that he was very important for Morgoth, and many of his actions arenot mentioned in the text. It is however clear that he had great power to be of the same rank with Gothmog, and also from his duel with Huan it is clear he was not weak either.