I've never even seen Virtual Cop 3 and it certainly looks dark. Virtual Cop 2 was incredibly fun and light hearted though. It's part of why it was a great title.
One great thing about House of the Dead is that even though it's gory and violent, it almost NEVER takes itself seriously.
I'm sorry, but I knew quite a few parents back then that wouldn't allow their kids to play Virtua Cop's 1 or 2 back in the day since it used a gun and gave you points for making multiple shots to the body. Same with House of the Dead. That mantality has gotten even worse today, thanks to the rediculous amount of shootings here in the US. The games may not take themselves too seriously - Hell, I don't - but parents do.
Jet Set Radio would be removed as well since many parents don't like the fact that it "encourages defacement of private property".
Mind you, I'm not agreeing with these statements. However, SEGA's always tried to cater to a broader demographic. Their philosophy was quite different from Nintendo's then, and it still is now. SEGA injected their games with attitude, along with a youthful defiance toward Nintendo and it's whole "family friendly" image.
That's SEGA to me. That's what SEGA was to my brother. He didn't wanna' play as some plumber with a Sir Galahad complex lost in fantasy land, or as this 'wittle fairy boy....with a Sir Galahad complex....living in fantasy land. He wanted to blow the crap outta' enemy aircraft in After Burner, or kill Xenomorph-like creatures in Alien Syndrom, or killing badass ninjas in Shinobi. SEGA had an edge even then.