Are other retailers worldwide happy with the way Marvel, and to a lesser extent DC, have embraced manga in the last few years?  We certainly aren't.  Yes Japanese manga is popular and has sold reasonably well for us (until we lost the biggest publisher, Viz -- due to them having neglected to include foreign sales when they bought the license), but they aren't as popular as they used to be.  A few years ago they were the 'in thing', now they have settled down to their particular niche market.  In my opinion, the time for western publishers to try to cash in by adopting the manga style in their products has passed.  Marvel comics that are drawn in a pseudo-manga style never do well for us.  The Marvel fans don't like the art and the manga fans prefer the real thing.  Marvel's Mangaverse sold badly for us, and it looks like the Tsunami line is going to follow suit.  It's always been the case in any commercial art market that occasionally something creates a buzz, then all the big companies put out as many cash-in imitations as they can until they kill the interest stone dead with over-saturation, but in this case I think Marvel has run after a bandwagon that had already passed.