Riot did u forget to nerf Rumble?

Ok this was my first time playing against Rumble.Ok so at lv 5 his q deals 300+ dmg?Like that ability is a low cooldown,aoe dmg,with high base stats and 110% ap scaling?And he has even more dmg with his bullshit passive.And you know all of his abilities have low cooldowns so u cant trade with him when he just used his q on minnions cuz he will just come back up in 5 seconds.Another thing.Why is his w shield so big?Let me do some simple math here: late game an avrage mage has about 600-700 ap.Let's take 650 ap.So his shield with his passive at 50% gives him a 330 + 488(from the ap ratio)=818 shield on a mage with lets say about a 3-4 second cooldwon. A final thing about him.He is kinda like Phanteon in lane.He is a rly good lane bully but the big problem is....that he is a mage => Good late game teamfight with his q and his r. To balance him out either just double his cooldown so you can trade with him in lane or revert all of his buffs.Oh yhea he got 6 buffs in a row: Scrap Shield Scrap Shield Bonus movement speed increased to 20 / 25 / 30 / 35 / 40% from 10 / 15 / 20 / 25 / 30%. The Equalizer The Equalizer Cooldown reduced to 100 / 85 / 70 seconds from 110 / 100 / 90. V9.6 The Equalizer The Equalizer NEW EFFECT: Now triggers effects that are triggered by DoT AoE abilities. V8.12 Scrap Shield Scrap Shield Base shield strength increased to 100 / 130 / 160 / 190 / 220 from 80 / 110 / 140 / 170 / 200. AP ratio increased to 50% AP from 40% AP. The Equalizer The Equalizer Base damage increased to 140 / 210 / 280 from 130 / 185 / 240. AP ratio increased to 35% AP from 30% AP. V8.7 Flamespitter Flamespitter Total base damage increased to 175 / 210 / 245 / 280 / 315 from 135 / 180 / 225 / 270 / 315. Damage to minions changed to 60 / 65 / 70 / 75 / 80% from 75%.