While the 7.1 Sound was great, i think the Sound Design this time was the weakest of the three movies. The Transformations didnt sound that impressive and, most of all (i wonder if anyone else noticed that), there were some reused sounds from ROTF. That wouldnt even be so bad, but they reused the two probably most famous sounds of ROTF: Megatrons famous WHAA-GHAAAA and the dying sound of Optimus that kinda sounds like a computer that gets turned off. Its worse that both of these sounds were reused in the final minutes of the movie. WHAAA-GHAAA comes into play when Sentinel Prime falls to the ground, im not sure if it was before or after megatron steps in. The dying sound of Optimus can be heard when he looks over the battlefield after he took the head of Megatron. I think that was kinda lazy.