Well, the flood was pretty amazing. He didn't make everyone on earth disintegrate into ash in a flash of light (he could have-- he's God, after all). Drowning is a hell of a way to go. You have total awareness of what is about to happen. You are overcome with panic and anxiety. You are totally helpless to stop yourself from dying in this fashion. God made sure that we had a natural anxiety toward deep water after we have been out of the womb for a year or so. What would have been better is if God would have slashed everyone's Achilles tendons so they couldn't swim at all. That would have been brilliant and right up his alley. What I wonder is what it sounds like to hear all those babies and children crying for help from their parents. That's got to be like going to the symphony for God-- just sitting back and listening with a big smile on his face.
However, you may want to first consider Isaiah 29:16.
Hillary says we shouldn't question her, either. I think she's right, don't you?
Regardless of what she thinks, she's not God.
I guess if you want a reason to hate God you have to make stuff like that up.