I totally agree. The only reason I kept buying it was for Becky's art. The pacing for the story was incredibly slow until the last issue -- and a lot of it felt super vaguely written and broad throughout.
It just felt like it didn't have the spirit it was really confident it had? I remember when it was first announced and I felt like it'd have the same kind of balls to the wall punk old west shootout on speed feel that the videos had but that just wasn't delivered. Don't get me wrong, it had some really nice elements, Becky's art is always lovely to pour over and you had the evolution of Korse as a character, expansion of the universe, some great character designs but it never felt like it got up to speed. G set the bar for his comic outings pretty high with Umbrella Academy - it was the freshest feeling thing I'd read since Doom Patrol, and from a creative perspective Killjoys was kind of a grand concept to be condensed down to a miniseries, perhaps I just walked in expecting something it wasn't going to be.