A sign that all the TV advertising dollars in the world can’t always buy you market share (useful lesson for politicians, too): a list of top ads in the U.S. for tablets puts Samsung way into the lead among vendors – but Apple, which actually is the best-selling tablet at the moment, doesn’t even make the top-10.The rankings, from ad analytics company Ace Metrix– a startup backed byHummer Winblad Venture Partners, Palomar Ventures, Leapfrog Ventures, and WPP --*say they determine an ad’s “Ace Score” based on viewer reaction to national TV ads in which consumers are asked to rate ads “on a scale of 1-950, which represents scoring on creative attributes such as relevance, persuasion, watchability, information, attention, etc.” Respondents, it says, are randomly selected.