I have to preface this by saying I wasn't much of a fan of Streets of Rage—I stayed away from the Sega Genesis and was more into Final Fight and Double Dragon. However, I do understand that there are people out there that absolutely love Sega's contribution to the console beat-'em up genre.
Some of those fans love the series so much that they were compelled to spend their free time and money creating what no one has been asking for: a Streets of Rage movie. It is pretty much what you would expect, but although a two-parter, it actually only totals about 30 minutes. So if you have the time and still have warm and fuzzy memories of Streets of Rage, be sure to check it out.