The Red Wedding was epic, but can't surpass season 6, episode 9 in sheer filmmaking.
The 4th season was great. Tyrion's speech was AMAZING - one of the best scenes in the entire series.
I enjoyed The Hound scenes in episode 8, but the Braavos scenes were starting to get a little crazy in the "believability" department, IMHO.
Agreed. Tommen was never Joffrey, so him doing that would have been too against character for him, but it did show that he was weak. He was weak because he was too young.
You forgot about Lyanna Mormont!!!
And you also forgot Tyrion truly earning The Hand of the Queen. That was such a great scene.
IMHO, you missed two epic storylines: Arya is FINALLY finished with Braavos and Dany is FINALLY coming to take over Westeros. No more Mereen. Weeeeeeeeeeeeeeeeeeeeee!!!
Season 6 is also epic because of all of the storylines they set up for the final two seasons:
Varys vs Littlefinger
Littlefinger vs Stark
Stark vs Stark
Lannister vs Lannister or Lannister vs Lannister vs Lannister
Targeryen vs Stark
White Walkers vs Westeros
The Hound vs The Mountain possibly
The next two seasons are going to be truly epic.
Personally, I think it will be Cersei vs Jaime and Tyrion.
As an aside, I'm legit scared about The Mountain. Every time that character goes against anyone else, I get so stressed out. He's an unstoppable force and I worry that there WILL be a Cleganebowl (I'm one that's NOT wanting to see that) and that The Hound is going to get destroyed.
How are they going to kill The Mountain? How?
I do want to see The Hound have a somewhat happy ending and still be alive at the end of the series, and I can't see that happening if there's a Cleganebowl.
As another aside, I'd love a Hound and Arya spinoff series.

I'm re-watching the series and I'm in the second season and I am totally an Arya/Gendry shipper now.