I actually don't mind the design of the ace, it may be very basic but for me it's quite eye-catching, and as the saying goes, less is more. However, the font on the ace really doesn't suit the theme, and that's what puts me off.
Also, I'm not a big fan of extremely repetitive or tessellated back designs - to me it just looks like someones copied and pasted something everywhere and passed it off as a back design, not really taking the time to design a proper back.