I don't think that's fair. While I don't think a new "subplot" in a movie adaptation that's already too long is wise, in all other respects Snyder seems to be hewing very closely to the book. That teaser was like an intentional love letter to Watchmen fans.Electric cars were one of the most visible differences in the Watchmen universe - trying to 'add' a 'timely' subplot about 'alternative fuels' is not only deeply retarded and artistically bankrupt, but shows they've never even opened the book.
Heck, I'm pleasantly surprised that he won the battle to have Nixon as the president.
At any rate, they say the current cut is 3 hours long and shit needs to go. A subplot that wasn't in the original story is looking at the cutting-room-floor.