I love how Enel was literally godly powerful and the only reason he was defeated was that he, by chance, encountered the one person who could nullify his ability. He wasn't some scrub who relied on it too much, either - when Luffy shows up he starts whacking him around with his bo staff and pulling tactical moves like gold manipulation, and he was already the strongest Sky Islander we know of even before he got his fruit. I loved that.
IIRC Oda said his Blue Seas bounty would be 500,000,000, which was the highest known for a long time.