A couple items of note just looking at the mechanics. The term "skill bonus" is used before being defined (both on page 6 of the QS), and it's defined in a colored note - normally those are used for sidebar text, rather than important text, and the prior inline-sidebar-type is of the sidebar type text...
Really, it Skill Bonus should be defined on page 3 right after "skill ranks" - as that's the first place one would expect it.
Also,1d+SkillBonus vs TN X, given the multiple comparisons, is easier to parse as 1d vs TN-SkillBonus. This doesn't change the math, but does change the calculation speed for the roll.
The passive rule seems inconsistent and adding extra complexity... why not just make it Skill Bonus ≥ Difficulty-1 ? Also, as written, the passive rule only uses the given task levels; this makes it harder to use when GM's choose to set numerical TNs other than the given discrete levels.