In one of the Smog articles,they wrote about the top 10 offensive threats.Under Salamence's description,there was a question asking if it would ever be uber.The answer was :
"On paper Salamence seems very close to be regarded as an "uber" Pokemon. In practice, though, it does have some issues. The prevalence of Stealth Rock and Sandstorm hurts Salamence's performance. Not only does it take 25% just from switching into Stealth Rock, an extra 6% damage from Sandstorm on top of 10% per turn from Life Orb recoil wears it down extremely quickly. Remember the comment regarding to Outrage locking Salamence onto the field? That can also spell trouble since it allows a Steel-type a free switch-in after a revenge kill. For example, a Choice Band Scizor can easily KO a 50% Salamence locked into Outrage. What's worse is that Pokemon like Mamoswine and Weavile can come in for the revenge kill and easily dispatch Salamence with STAB Ice Shard."
So I think residual damage plays a part in keeping it from becoming Uber.
"On paper Salamence seems very close to be regarded as an "uber" Pokemon. In practice, though, it does have some issues. The prevalence of Stealth Rock and Sandstorm hurts Salamence's performance. Not only does it take 25% just from switching into Stealth Rock, an extra 6% damage from Sandstorm on top of 10% per turn from Life Orb recoil wears it down extremely quickly. Remember the comment regarding to Outrage locking Salamence onto the field? That can also spell trouble since it allows a Steel-type a free switch-in after a revenge kill. For example, a Choice Band Scizor can easily KO a 50% Salamence locked into Outrage. What's worse is that Pokemon like Mamoswine and Weavile can come in for the revenge kill and easily dispatch Salamence with STAB Ice Shard."
So I think residual damage plays a part in keeping it from becoming Uber.