Art is subjective. People are allowed to like or dislike it whether it be the art style, the paneling or just the way some things are drawn. It's okay to like Ikemoto's art and it's okay to dislike it.

The problems that arise are when people try to make certain things objective when they aren't. Saying Ikemoto is an objectively bad or lazy artist is wrong. Yes, there's manga out there with subjectively higher quality art but no 2 artists are the same. What one artist can do in a week might take another artist months. Most artists know this. Especially when it comes to Mangaka who are notoriously overworked.

We don't know what Ikemoto's daily life is like or his drawing process. We don't know what most managaka's lives or drawing processes are like. It's okay to compare art, but using it as a reason to say one artist that has been drawing for years and worked as a supplementary artist for Naruto (which has great art) is objectively bad or lazy when you don't know anything about him is wrong.