It's not a very good manga, the art is shitty and badly detailed, I had trouble seeing what was going on in a lot of panels. The character development is non-existent. The action doesn't work because of the aforementioned poor art and I'm just more of a edgelord who prefers to see the protagonist kill his enemies so I guess the whole premise of Trigun just wasn't for me. (Although the series does get darker later on)

The comedy was not very good so the darker turn when it became seinen was welcomed, but overall I just didn't care for it.