Why is amumu forced to be a terrible character for so long?

He's been bottom tier for so long now and honestly I don't understand why. It's not like his kit is toxic and/or unfair. You can dodge the bandage and he has to be in melee range to ult you unlike sej who can throw her ult. So what about him is exactly the reason he's forced to be terrible? Whenever I get an amumu jungle on my team I just feel like dodging and it's sad because I use to love playing amumu back when holy hand grenade amumu was decent. Please buff the poor mummy, either with base damage buffs or AP scaling buffs. Or even more % health damage on w for a niche pick tank team killer.
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