^ That statement makes no sense. Watching things chronologically should not in any way depend on watching TWS smack-dab in the middle of watching AoS Season 1, at least not if the showrunners were doing their job right.
It's narratively counterproductive for a writer to assume that audiences are familiar with everything that has happened in a shared universe and consequently hinge the narrative cohesiveness of a particular piece of said universe on said audience familiarity.
R_Hythlodeus statement makes perfect sense, chronologically within the MCU, there are specific events of SHIELD that occur before events of TWS and specific events of SHIELD that occur after. It's the MCU, everything is connected. The shows do not exist/were not created in a vacuum. The showrunners went into the first season knowing that there was a major reveal in TWS on the horizon (they saw TWS script before season 1 went into production) and they planned their season 1 story arc accordingly to have certain setups and followups centered around that reveal since it impacted them in a MAJOR way. I imagine Age of Ultron to be the same way. SHIELD is going to come back in March after break, have most episodes air of the 2nd half of the season, then Age of Ultron will be released and then a following 3 episodes will air after that movie. I imagine at least one of those ending episodes will have fallout from Ultron and won't truly fit anywhere chronologically except after that movie comes out. This is the nature of tv shows, they run over a long period of time, so with the MCU being interconnected there's going to be overlap (chronologically) with the movies.
I agree with SirStrangefolk and R_Hythlodeus. Chronologically, it wouldn't make sense if you don't break up the season(s) of the tv show(s). And if I were to do a major MCU marathon, my list would look similar (but maybe a touch different) from Mbj's. I'd probably do:
Captain America: The First Avenger (because the bulk takes place during WWII)
Agent Carter (TV series) (if it does indeed take place before the one-shot, otherwise it might be shifted to after the one-shot)
- Agent Carter (one-shot)
Iron Man
Iron Man 2
- A Funny Thing Happened on the Way to Thor's Hammer (one-shot)
The Incredible Hulk
- The Consultant (one-shot) (Coulson and Sitwell look like they could be in a diner that's out in New Mexico - hence why I put the Funny Thing one-shot first)
Thor
The Avengers
- Item 47 (one-shot)
Iron Man 3
- All Hail The King (one-shot)
Agents of SHIELD, Season 1 Episodes 1-7
Thor: The Dark World
Agents of SHIELD, Season 1 Episodes 8-16
Captain America: The Winter Soldier
Agents of SHIELD, Season 1 Episodes 17-22
Guardians of the Galaxy (James Gunn has said it takes place when it came out, so August 2014)
Agents of SHIELD, Season 2 Episodes 1-19
Age of Ultron
A
gents of SHIELD, Season 2 Episodes 20-22 (this is assuming at least one of these final episodes has fallout from Ultron)