Honestly I don't know what happened to his dad. I thought he was dead, then it seemed like he left Diggle to watch him (where's he gonna go?

). But ya, you're probably right. Green arrow doesn't have a whole lot of villains, so I don't know why they'd kill off one of his biggest ones in the first season though. Actually, he has a lot of stupid villains. Most of his good villains are Batman's and he has a couple himself.
As for Arkham Origins: Not having the same actor for Batman sucks, having multiplayer may suck, playing as Deathstroke will be SICK, the Black Mask as a villain should be good, the fact that they're planning on releasing Arkham 3 next year makes me think less effort will be spent on this one, though they are being published by 2 diff publishers so maybe not. I LOOOOOOOOOOOOVE the Arkham games, so I guess worst case scenario, this game will be OK and we'll be another amazing game next year.