Rammus needs a Rework
Let's compare 
to every other Tank/Bruiser in the game
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Bad scaling (No health scaling, can't use AS, doesnt benefit from his own AD passive etc.,)
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His damage is almost nonexistent unless he gets attacked or they stay forever, and he has no way of fighting other Tanks because no HP damage
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He can't reliably and quickly kill squishies and is only really a nuisance to them
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Not as much utility or CC as Other picks and his are harder to use anyway
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His best use cases are far too specific and those specific cases aren't good enough
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Can't duel or skirmish well at all nor can he secure kills
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His Ultimate isn't useful as a teamfighting tank since it provides no utility and the damage takes a while to work
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No ranged presence so he has a hard time finishing the job or even poking, most tanks dont have this problem
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Relatively immobile despite a large MS boost on his Q, really easy to avoid it and end it early
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Can't clear jungle or waves or really push turrets well at all, even with his Ultimate
