Rammus seems a little weak at the moment. He could use a slight buff like making his powerball deal more damage the faster you are moving at the time of impact. Or, making his ult deal the same amount of damage over a shorter duration say like 5-6 seconds instead of 8. Or even buff his base stats like 5 more movement speed or a little hp regen or flat hp, idk. I'm not sure exactly what he needs but he could use a little help.
With the recent Udyr buffs I thought I'd give him a another try but he is still lacking something. An entire rework might be in store for this champ because he just gets kited to easily. It's interesting how he lacks an ult and this allows you to skill him differently and such for the lane or the jungle etc. But, he lacks that one amazing move/ulti that can really turn the course of a game like many other champions have such as amumu, shen, malphite, darius, riven, etc. Also, his dps seems really low. He can clear the jungle like a boss but so many other tanky dps champs fill his role much more effectively atm.
I could be really far off with some my statements just my opinion.