let me tell you how bad the rammus rework is
he no longer counters riven, if you pick rammus into riven in the top lane for instance, you will lose. it wont even be close.
used to be a favorable matchup, now he gets decked just as hard as nasus.
rammus needed the flat armor because of SLOW clear speeds and poor ability trades leaving him items behind everyone else. you put too much scaling onto W and you're leaving him with no self kit damage. tell me how exactly hes going to kill jungle monsters or trade in the top lane? HE DOESN'T.
im guaranteeing you go straight to level 18 max item build to do all of your internal testing. now is exactly the time to stop and ask "how will his 1-6 play out"
(insert ADC here, unless they build QSS in which case remove all adcs)