It's always bothered me a bit to have 5 of a kind outrank a royal flush in poker hands with wild cards, but I had accepted that on the assumption that if you crunched the numbers, you'd find 5 OAK was in fact the hardest hand to achieve.
Recently, I have been playing some Dealer's Choice home poker in these games wild cards are the norm, but never are Jokers used, at least in my experience.