I can agree on Nami, Rammus, and Galio.
I some times play Nami but she not really that good of a support when you compare her to other supports that's dominating bot lanes. Not saying she sucks, because she's still a pretty good support in general but others can do her job better.
Rammus was hurt badly when they increased the monster's health. I don't jungle, but a friend of mine said that Rammus was already a slow jungler and now that the monsters hp has been increased even more it probably basically killed Rammus jungle. (well not really, but did kill off his popularity a lot). Also when you think about it, his passive is a weaker version of Galios. I think Rammus's passive should increase to 50% of Armor instead of 25%. With the items out now, most people really don't bother to much with Defense, and just use HP items (that offer little or no defense) like Warmog's, Sunfire cape and Aegis etc.
Galio is still one of my favorite mid lanes. Going MR on him and then laughing at the enemy's low damage on him is fun...but he is not good at all at getting cs and his pokes aren't that good which makes it easy for the enemy to keep hitting you (although slowly killing you). I don't really know what they could do to make him better...His late game is great and a well timed ult changes team fights easily, so he really just needs a little help with his early game.