If I weren't keyed-in to the Terminator franchise, I wouldn't have had a clue what the hell was going on in Terminator Salvation. "HK's" and various other acronyms are thrown around like they mean something to the uninitiated. McG makes the pictures pretty and makes the whole thing look good and smooth, but the movie was dragged down by the "how do you solve a problem like John Connor" conundrum of perpetuating a franchise that has time travel at its center. You can only re-do your continuity so many times before everyone is lost. Having a series mythology timeline as a prominent supplemental feature on your home video release isn't really a good sign.
The Maximum Movie Mode is done over the theatrical cut of the movie rather than McG's preferred director's cut version, which is sort of puzzling. I do really like that for the purpose of picture integrity, they put the two cuts on separate discs. There are a couple of featurettes, one focusing on the Ducati-integrated motorbike Terminators and the other on how they explained themselves into the new movie's story. The movie looks and sounds fantastic on Blu-ray, but it's not going to be as indelible in fans' minds as T3, and boy can people hate on T3 if you give them a chance.