So, i loved ALMOST everything about this edit, except the waitress scenes. Those are terrible quality video and audio wise, and they don't add anything to the story, in fact, they slow those sections of the story down and the pay off is the same for what we already had, which is to say: very little. That said, the quality of those scenes are not the editor's fault, and they are put in as seamlessly as possible. Also, the other scenes, with Cap, with Banner and the custodian, all of that is exceptional and adds so much to the narrative. Overall this is a great edit because of those additions, but I really wish the waitress scenes were removed.
This edit is very technically sound, but I felt the scenes included did little to add to the viewing experience. I feel like while the new scenes explain and expand on some stuff, it makes the rest of the film less charming. The subplot showcasing Maria Hill as a mole or cool, but the new prologue that comes with it feels incredibly atonal compared to the rest of the film. The alternate Fury/Council scene, while explaining why Hawkeye didn't kill Fury, feels unnecessary, and it removes the line about wars being one by soldiers, thus making the transition over to Captain America more abrupt. Speaking of unnecessary explanations, it's easy to see why the scene where Loki devises to break the Avengers was cut, especially since it doesn't change the fact that it's, as Tony said, "not a great plan." Lastly, I didn't care for Cap handing the Chitauri weapon to the police officer, since that results in us seeing him get killed, which is a real downer, and at the point in the movie the audience shouldn't be feeling down.
There are only two scenes that I felt should have gone back into the film. The extended Captain America scene (maybe excising or doctoring the part where it says Peggy is in London, since she seems to be living in America by Winter Soldier) and the part where Harry Dean Stanton convinces Bruce to go back into the fight (cutting out where Bruce explicitly states that he's going to Stark Tower, we should figure out what the endgame is when Tony does. The scene would have Bruce going "yes...no...I don't know.").
I do feel bad being so negative in my review, but sometimes less really is more.
I am very grateful toward samspider3 for making this edit, it is well made and the cuts are very seamless.
Unfortunately most of the added stuff has been cut from the final movie for a reason, and I think that only 1 or 2 scenes should really have made it in because they detract from the main story, especially the waitress scenes, the added Loki scene, and Maria Hill replacing Nick Fury in the council scenes I'm not too fond of because 1. Nick Fury is a much more interesting character and is better written and 2. Samuel L. Jackson is a better actor than Cobie Smulders, at least in my opinion.
However, the editing is VERY well done, 10/10 from a technical standpoint this is a marvelous edit, really worth your time. Video/Audio quality is much better on the original but that's only because the deleted scenes are not available in HD (they're not on the blu-ray). The added scenes add a depth to some of the side characters and even some of the main ones, like Cap. His additional scenes really stand out as the best in my opinion.
Still, the action intercuts toward the end detract from the story so I don't think this will replace my Avengers copy for this movie seeing as most of it is really superfluous. I do think every MCU fan should watch this at least once though, it's well worth it.
While I liked this edit, I thought it could have been done better. Only some of the deleted scenes were colour corrected, meaning the ones that are not stick out like a sore thumb. I'm personally not a fan of the new framing device. But other then those things, the edit was well done.
While I really liked the beginning of the edit with Hill at first, I kind of missed the original intro, and felt like this compromised the ending a bit, which in my opinion wasn't really seamless, especially when compared to the original.
Some of the added scenes were pretty great and IMO necessary additions, but some of them weren't really as great: The Hulk scene with the security guard would be great if not for the fact that it spoiled where Loki was going to open the portal to the audience, and I think finding it out with Stark really works wonderfully. Some of the added stuff in the battle is good too, but at the same time compromises the pace, like the bits with the guard and the chitauri gun (the audio and video of this part is also somewhat jarring). The additions with the waitress were great, though.
All in all I still preferred the original cut of the movie when putting the pros and cons of this edit. But that's just me. It's still a pretty good extended version of the movie.