Star Wars, from the very first film, has had genocide on a planetary scale. The real problem with the Star Wars TFA death toll was the one-upmanship of the planet killer - we're going to top a WMD which can destroy a world with one that can destroy three worlds at once!!
Star Wars is a hellish universe, though, let's be honest. Every 20 years ago some magic Hitler only on a galaxy-wide scale turns up to tip the worlds into destruction. Any victory, no matter how hard won, seems to be swiftly lost in the face of another, worse menace. Characters are corrupted and turned to evil for, frankly, incoherent and nonsensical reasons
Star Wars is probably a bleaker universe than Warhammer.
Asinine comparison with Man of Steel, though