Or it could be due to the fact that Toriko is a manga about food.
It was number 4 last year if memory serves, and it does really well in JP, so concept is not a problem. The century soup arc is proof that Shimabukuro can dish out good characterization and interlace the world building with the plot, the problem is that he is really going overboard with the action. He has gone from fight to fight non stop in the last few arcs. Too much action is just as bad as very little of it, he needs to strike a balance.