I watched the DC Animated Comics movies: Death of Superman, Reign of the Supermen, and Batman: Hush, in the past few months.
I think Death of Superman is a great take on the original comic. There were significant changes from the comic: the movie uses "modern" Justice League members (Flash, Green Lanturn, Aquaman, Wonder Woman, Batman, Martian Manhunter) instead of the more obscure 90s Justice League members ( Maxima, Blue Beetle, etc. etc.). Otherwise, it was pretty good. The movie ends with basically a trailer for Reign of the Supermen (the next chapter in the story). Unfortunately, Reign of the Supermen wasn't as good of a film.
Fortunately, Death of Superman is a fine arc in of itself, and doesn't really need the other movie to "complete" it. Only watch "Reign of the Supermen" if you can't stand the obvious "downer-ending" that the title of "Death of Superman" promises.
Batman: Hush wasn't as good as "Death of Superman", but it was actually a fun watch. "Hush" is a new villain to appear in Gotham, and is a master manipulator: pulling many familiar Batman villains into the scene (Bane, Catwoman, Poison Ivy, make appearances within the first 10 minutes, and many more villains pop up as the film continues).
The movie does sell Hush to be a great mastermind: manipulating other villains into fighting Batman, wearing Batman down over multiple fights (while Hush manages to avoid Batman's detection for a very long time). The best parts of the film was seeing the shear number of Batman villains appear, and there's a pretty good story for how Hush manages to get all of them to fight Batman. Bane, Catwoman, Poison Ivy and Hush themselves constitute less than half of the villains.
The later villains are: Followed up by Superman (!!), Harley Quinn, Joker, The Riddler, Clayface, Scarcrow
from my memory. Its quite impressive that all of these characters play a role in the film.
The unfortunate thing is: while there were many great fight scenes and tense moments, the final Batman vs Hush finale was thoroughly mediocre and even predictable. Easily the worst fight of the film, with extremely predictable writing. The tension Hush was building up was completely lost in the final scenes... as Hush performs the greatest villainy downfall move ever: telling the main character a detailed explanation of your plan for no reason.
With that being said, Batman Hush was worth watching for pretty much the rest of the film. Everything except
the ending was quite good and I think I can recommend it on that grounds alone.
EDIT: It seems like the parts I didn't like about the movie more or less line up to the parts where the movie diverged from the original writing