I quite like Darren myself, be yeah he was a bit of a Mary-Sue. Interestingly enough, I've heard Paramount use his "Come Fly With Me" in several films and shows instead of paying for Sinatra's.
I loved Bada-Bing too. I like all the classic movie parodies DS9 did: Ocean's, Bond, Casablanca
(I'm forgetting one.) better than most do.