I just started with this one. So far, it is good.
From what I saw on YouTube, I wish repainting was much simpler. Maybe an external repaint tool that loads a bus painted white, and a set of .png files that wrap the sides and ends of the bus. But that's just an idea.
Also, when creating routes in career mode, I noticed that the most recently created/edited route goes to the top of the list. I would rather the list be sorted by name or route number so that a route I want to drive is easier to find.
Those are my ideas for now.