So Roo may not be great after his first hit, but he would hit even stronger than Gene ever did if you consider how much the God Hand powers up someone. Before the God Hand, Gene basically couldn't fight at all and loses badly. The God Hand amplifies natural abilities, so Gene's own bad skills, strength, and dodging speed were upgraded to what you see in the game. Roo is already strong and fast with the hand, being able to punch out machines and robots and dodging cars and motorcycles. His God Hand amplification would be immense.
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You beat yourself up with your past. Don't blame yourself, blame the world. Blame God. Blame me.