I think you're overplaying how good Zexal is. Sure, it was better than ARC-V, but it wasn't anything special. By all means and intents, it was a classic kid anime with good production values that didn't stray from its formula even once. Only these days, you need to actually innovate to be considered good.
The amount of hate Zexal received is justified when you consider that it's just a dumbed-down version of the original. And Yuma's character frustrated many viewers.