The thing about tanks is that with all the assasins and fighters basically stomping games, they pose the biggest threat especially when they are able to outdamage you while tanking what little damage you are doing to them.
I really think if ADs weren't getting such a "dong licking" from the devs right now that the Tank meta wouldn't be hitting people so hard. Assassins aren't really meant to be able to take on tanks, rather it's the other way around.
And the only reason I can see Rammus 100- 0 anything is if you aren't running away like you should be doing as a squishy especially an AD squishy. His atk scales with his armor by 25% and if you were crazy enough to have a full AD team his very presence in your lane is going to be hell because only his ARMOR is what boosts his AA and w.
Also if tanks are really giving you trouble
and Kiting actually do work if you take time to build them instead of just going with flat high damage.