There are occasionally items that we receive for review that utterly shock us with their mediocrity and poor quality—we’ve opted not to bother even putting them on iLounge any more, lest people actually consider paying money for them. Elago’s Slim Fit Case for iPhone 3G ($25) is not one of them, but it comes pretty close, using the same unimpressive Korea-developed rear shell we’ve previously reviewed and disliked from United…