The problem with The Fall in 2011 is straightforward, really. The band isn't very good. Or, to put it another way, they are very slick and versatile rock musicians, but they have absolutely no sound of their own.
There’s nothing wrong with experimentation, and a handful of rock tracks here could have worked well. But to make a whole album based around a sound Lil Wayne is so inexperienced with is simply outrageous.