Usually, I’m not a fan of ‘old school’ animes because of the art but I made an exception for Trigun after reading the summary.
I think for a series like Trigun, the protagonist is a huge factor influencing one’s decision to whether they should watch the entire series. The protagonist really got on my nerves because of his nature and his policy to not kill even when he is inches away from death.
EDIT: Let me rephrase my comment about old school anime. I just don’t like it cause it’s not vivid enough. I like it when things are clear, sharp, and defined.