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Amazing Ampharos
If you couldn't see the situations in which that tipper tilt or aerial that you [got] hit with [by] Lucina which would've killed on Marth, then I'd say say you're missing out on perspective.
Also Lucario having a poor neutral is pretty critical. I put time into learning to play the character as well and I was disillusioned by how poorly he actually is dealing with the characters you're picking him for (something you'd expect from a character of top tier stature). Oh you want Lucario for Sheik? I'm pretty sure we aren't seeing him take out sheiks frequently like pre-patch/3DS, sheik's edge guarding game and significantly better neutral (i.e. every tool is twice the range and/or start up of Lucarios) developing doesn't bode well. Pikachu and Sonic, the characters which feared him in Brawl? I'm not seeing him handling either well when they have significantly better grab games and mobility and are almost universally buffed from the prior game, while the impact of Lucario's range nerfs from Brawl and post-wifi 3ds blues (remember little mac?) get more apparent and felt by the day. It's honestly better for the game Lucario isn't able to overwhelm most of the cast by sheer survivability + virtually unstoppable aura; because that's what it felt like with vectoring around and 3-10 frames of delay on wifi.
You know who else can take stocks in three reads? Heck,
two? Ganondorf. No requirements necessary other than a good power shield in mid range. Or the roll hard read that we all love to see. Lucario has to take 100% while hopefully getting the opponent to 80% in trades or otherwise before he's applying
that much pressure.