Yeah I kind of suspected that we shared that completionist gene. To be honest if you're merely annoyed it'll be a win. To clarify it's the bits that refer back to the comics that make the series bearable for me. It's those tidbits that keep me hanging on.

No worries re the last HL movie. It's much better not to have seen it. Trust me. *g*

If memory serves I think someone posted a list of the episodes of AoS you need to watch if you can't bear to watch the entire series to date. I'm tempted to say it was on io9 but I can't swear to it. Yup, here's a link,

http://io9.com/which-episodes-you-must-watch-to-catch-up-on-agents-of-1572676925

And there's also this list as an alternative,

http://www.themarysue.com/must-see-agents-of-shield-s1-eps/

I hope this helps.