Just viewed Avengers DVD (which came from my 4disc BD set)
As expected for a high profile release, picture and audio quality is top notch.
Viewed it with my Optoma HD70 projector. This DVD is demo material. It's not HD but for SD it's encoded very very well. Details abound, colors pop, skin tones are rock solid and sharpness is applied in the right places. All in all I am quite impressed with this DVD release.
Sound is equally engineered with care. Thundering "LFE" throughout the picture will make you smile and think how good of an investment you've made with your system. Sound Effects are all delivered with surgical precision and surround effects add to the atmosphere. Best of all, I must say that Avengers quite possibly has the most coherent dialogue of any DVD ever.
If BD did not exist, this would be the #1 DVD for demo