I love Enel. He didn't just hax his way to the top with his OP fruit. He was already the strongest warrior on an island of already strong warriors before he got it, and once he realized Luffy has an advantage against his fruit he reverts to his bo staff skills, which are pretty impressive from the limited view of them that we get to see.
I feel like if he really honed his skills on the blue seas, he'd be admiral level, vice admiral at the least. As it stands he had absolutely no opposition in Skypiea, and as far as he knew he had mastered haki (mantra). With proper training, he'd be a monster.
I do recall Oda saying that his bounty would be 500,000,000 beli if he were a pirate, which is still insane.