Dont like re-watching flicks, but will defenitely watch this one several times, powerful experience. It was slow and distracted from the plot somewhere down the middle, but in overall I found it absolutely fantastic. They stayed true to Alan Moore as best as possible (watchmen is one of the least suitable for movie adaption comics there is, but the flashbacks was done topnotch).
I only didnt like Silk Spectre II, otherwise found The Comedian and especially Rorschach absolutely amazing (Rorschach is oughta be a main reason to watch it, seriously brilliant character), Dr Manhattan intriguing, and wanted to see more of Ozmyndias. But despite being 2.5 hours, they cant really focus so much on some characters (more flashbacks would have been good).