Newsletters that are quietly right, year after year, need somone like Mark Hulbert, the Consumer Reports of market-advice letter writers, to score their advice over time, otherwise they'll never get much attention -- and few subscriptions.
(Ignore Hulbert when he descends into punditry and high-concept number-crunching ["does the 'Santa Claus effect' work? the 'sell in May' rule?"], something MarketWatch demanded of him after he sold them his newsletter. Just read him for ratings and for facts culled from his data and fashioned into factual articles, which he still produces.)
There are some pretty good guides out there yet. Among them: Bob Brinker, Dan Sullivan, Bob Stovall. Stan Weinstein still gets hot streaks. Most of the old Rukeyser panel of guests were pretty good and can be listened to: Liz Ann Sonders, for instance, and Stovall and Weinstein. Gail Dudack is still around -- she was dropped from Rukeyser's group right at the end of 1999 because her value indicia for something like 18 months kept saying "sell, don't buy". Gail was right, the Elves were wrong, big wrong, that time.
"When the fairies are displeased with anybody, they are said to send their elves to pinch them. The ecclesiastics, when they are displeased with any civil state, make also their elves, that is, superstitious, enchanted subjects, to pinch their princes, by preaching sedition; or one prince, enchanted with promises, to pinch another."(Thomas Hobbes, Leviathan 1651)