Batman/Superman: Public Enemies Power Girl FTW/10
I have no idea what continuity this takes place in. Why would the American people elect Lex freaking Luthor as President? That didn't make any sense. However, the ensuing partnership between Bats and Supes was pretty cool. The fight scenes were great, although the Toymaker's final solution was a little...silly (how long did it take you to build that, exactly?).
The big news is that my favorite superheroine, Power Girl, makes her debut animated appearance. I'm torn about her design here. Power Girl will always be the artistic property of Amanda Conner for me, but this isn't terrible, just...a little too loose. I'm glad this movie strayed from the usual DC Animated Universe look (Batman: Animated/Superman Animated/JLA Animated), although most of the characters looked too beefy.
If you're a fan of the DC Animated Universe, this is a decent rental.