I absolutely HATE dealing with Ferrothorn. His combination of Leech Seed, Iron Barbs, Spikes, Stealth Rock, and decent offensive stats make it a pain to fight. It's ridiculous how even STAB Fighting moves fail to OHKO it, and the Leech Seed + Protect combo played well enough is enough to bring it back from the brink of death. That being said, I'm not sure if Ferrothorn is bad enough to be tested (I'm not against it. I'm on the fence). Having to pack a Fire, Ground, or Fighting move is something all teams are forced to do to get past Steel types. However, Ferrothorn is the only pokemon I've seen where this is a requirement. At least in Gen 4 with Scizor and Forretress you could wear it down with repeated neutral hits. It's defensive stats and typing allow it to shrug off anything not super effective. Not to mention that most of the time the neutral hits aren't STAB for Ferrothorn (Ground, Flying, Ice, and Bug). My felings for the steel UFO thing are that it's bad enough to be annoying, but not to the point where I actively want it gone.