Is Skarner a bad Rammus?
During the Rammus FotM that's going on right now, I think to myself - why would you ever use Skarner if Rammus can do everything he can do but better?
Skarner's role (and the role he's well known for) is to get close to a priority target, ult him/her, and have the team focus that target down. Rammus can do that too, but with far more effectiveness. Rammus' CC is not an ult (so he can do it multiple times) and has a far better MS steroid than Skarner. Not only that, but also Rammus can deal more damage, can 1v1 any AD champion and come out on top, and does not rely on skillshots.