Batman Earth One, Volume 3 was the best book I've read from Geoff Johns in quite some time! Maybe since Batman: Earth One, Volume 2. It's been 6 years (!!!) since the second volume was published and almost a decade since the first. Sometimes I wish the Earth One books would come out more regularly, but I think it might lessen the novelty.
I'm not really a "DC should never touch the Watchmen" person but I do think they should endeavor to make good comics when they use them. Doomsday Clock is not that. My perception might be a bit altered by having read this in single issues as they were released on DC Universe. The series is long and it had a very lengthy release schedule.