A LOT of most champions kits are not all that unique. Every ability can be called similar to another "but it has this effect".
Every shield is roughly the same. But each one has a unique effect.
Mundo's Q is a common effect. But it's very spammable if he lands them all because of his passive. He can overall spam them next to forever.
How many manaless champions have a long range hard hitting spamable skill shot slow that even scales with HP with a min damage. (Heck this is a long list for even a mana champion)
How many champions can have an AoE effect around them that reduces CC.
How many champions get a 40AD steroid that scales higher as your HP gets lower.
Honestly not many champions have "a lot of regen" on their ult. Let alone a long duration MS buff.
Point it out like you did and sure, he seems dull. But he does have a lot of uniqueness in his kit when you take a deeper look. Otherwise you may as well say Jayce's Q is bad because Karma does the same thing but slows.