If the "extremely retro artstyle" was a problem, it would be from the start, Toriko is a 2008 manga, it was already super retro at the time but it's actually part of the charm of the series, i would say that Toei ending the anime at the time definitely hurted the manga a lot, it had all the problems but still a anime that was doing quite good at Sundays and keeping Toriko relevant for kids and overall readers.
This is a good point, but also, the main thing that stood out about Toriko was the world building.
It had, by far, the best world building in a series I've read, second only to One Piece. Although, I found the world in Toriko to be more interesting than One Piece's world.
Another thing I'd like to add, though. Toriko is not a series that is an especially great marathon read. It's a series that requires process time, and speculation, week to week.
Marathoning through it quickly will confuse new readers, since they'll likely not pick up on the subtle foreshadowing Shimabu sprinkled in. Or, for instance, the part where
Teppei's head was in the food bowl.
That moment loses all impact when you can just instantly go to the next chapter. There's a lot of moments like that in Toriko, where you NEED to wait, to speculate, to absorb what you're reading.
So, when a person quickly marathons the series and tries to weigh in on the strengths and weaknesses of the series, it comes off as disingenuous, since they didn't experience the series the intended way. And I think that's a problem with a lot of other series and not just Toriko.
So many series benefit from week to week processing, and theorizing from other fans. Some series you can blast through quickly and lose nothing for it, but a lot of them aren't like that.