I did think it odd that it had a 'U' rating (suitable for all) in the UK - but having said that, there was no problem with the Streets of Rage series when they were first released on Mega Drive as they didn't have a rating. Strange.
I miss all those games, Golden Axe, Alien Storm, Revenge of Shinobi and Streets of Rage. I bought Sonic Gems solely for Streets of Rage and now I'm majorly disappointed ...