Entertainment Weekly has begun its subscription-only 'Listen 2 This' supplement this week, which features two pages of comic reviews ('Discoveries:  Comics').  JLA/Avengers (DC/Marvel), Madman King-Size Super Groovy Special (Oni/AAA Pop), and 1602 (Marvel) received As; and The Losers (DC) and Blankets (Top Shelf) were graded A-.  A sidebar by Warren Ellis touted From Hell as his 'all time favorite graphic novel.'   Frank Miller's Robocop, from Avatar, was graded a D.  Three upcoming titles were flagged: Dark Horse's The Chronicles of Conan, Image's Frankenstein Mobster, and DC's Hellblazer:  Rake at the Gates of Hell.