2) "Forcing" SOI on people. (I know, it wasn't really forced, but they should have seen the bad publicity coming.)
They should've had the good sense to realise there were heaps of much better ways to do it, ways that wouldn't piss off people, e.g. making it opt-in where people get a prompt to download a free new U2 album.
4) Crumbs From Your Table
Jesus, if the second-best song on HTDAAB is one of U2's stupidest decisions, what does that make the rest of the album?
Oh wait, it's HTDAAB. Its second-best song could still be a big blunder.