I have only had this set built for most of today, but it's epic! The best way to hear that is through this review...
The minifigs: Loki: Sweet super villan, expresses himself as true magical leader of an evil army
Foot soldier: Awesome, kind of movie accurate, looks like cool robot (In movie looks like cyborg), no laser rifle/spear (okay, because the general's laser in Captain America's Avenging Cycle isn't at all movie accurate)
Black Widow (Natasha or Agent Romonoff in The Avengers): Epic minifig, with Navy SEAL legs, cool black jacket and blue stripes on torso, 2x the cool faces, and detailed reddish hair, no guns, but she doesn't really need them, hands work fine
Thor: Sweet, Hammer small but sweet, cool hair, armor, legs and and very cool, detailed faces (sleeves on torso, not in movie, but hey, more armor for Thor)
Iron Man (Tony Stark in the Avengers): Awesome faces, thruster flames, flipping up and down mask, details, torso, legs
Chariot: Awesome way to really capture the design in the movie, fun to play with, not too big, not too small, fun to play with
Quinjet: multiple movie accurate rooms (yeah :-D ) 6/5 star design, guns flip out (flick missiles, but I pretend they're giant chainguns) sweet size, secret hatch, eject function, build rocked... Too much to explain! Pros and cons now...
Play: 10/5 stars
Challenging build (I loved it)
Amount of pieces
Overall: 25/10 :-)