An idea to make Rammus OK.

Rammus's trademark skill is his powerball. As great of an ability as it is, it gets interrupted very easily. As his only gap closer This can make ganks very difficult because hitting one minion will stop you dead in your tracks. A simple fix to this could be that Powerball not be interrupted by unit collision. Then on recast or end of duration of powerball, Rammus does damage in a small area that is the same size of powerball's current hitbox. This would put help Rammus out significantly without making him too strong, as he can still be CC'd or dodged during powerball. Show Rammus some love.