Is it just me or is Rammus completely out-classed this season?

I was playing some ARAMmus the other day and noticed how low his Armor was. Despite being lvl 14 with Thornmail and Deadman's Plate, I only had about 400 Armor. His W increases his Armor and MR while active, but he seems to be slipping into the role of Assassin. I've been altering my gameplay into a hit-and-run technique rather than tank and grind. When I tank Rammus I initiate with Q, throw up W and Taunt. But now I find myself initiating with W, throwing the taunt and peeling- keeping my Q for an escape.

When you pit Rammus against any other tank, he just seems like turtle soup. (Why I named my Smurf "Eat Rammus Soup")

Rammus is meant to punish those who attack him, but when an Ashe can win a 1v1 there's a problem. I remember a couple seasons ago playing as Rammus and a fool-hearty Jinx tried dropping some DPS AA on me while I was fighting Udyr. The Jinx melted her face off and I got the kill by simply ignoring her. Not this season, pal.

Can we do something about this?

Maybe Rammus should passively gain Armor and MR by levelling his W. Note- Rammus' abilities have no passive effects as it is. Or just buff his base Armor and Armor scaling?

All I know is Rammus is seeming weak this season.