According to The Guardian’s Word of Mouth Blog, it’s dodgy looking pumpclips and crap puns.

Are people really so put off by some cheesy artwork and a mangled Spoonerism? I just assumed many breweries, usually smaller ones without large advertising budgets, aim for something eye-catching to grab customers’ attention in an often crowded marketplace. I think it's massively stretching a point to claim that this is somehow affecting the industry as a whole; what percentage of beers really use these sort of names and images as promotion? The very fact that they've stuck in the writer's mind suggests these brewers may be doing something right, rather than getting it wrong, and the market will surely tell them quickly enough anyway.