It's not great, it's not awful it's just another underwhelming album from U2*. I wish they could find that spark again but I suspect Acthung Baby will remain their last truly great album. That particular album ( and the full list before hand ) is proof positive that when the all time forever and ever greatest bands list is produced U2 will occupy a spot very high up on that list.
* Not new material, reworked and acoustic back catalogue efforts.