Finished it with around 90% of total completion. Very good but Saints Row 2 is still my favourite, it's a much better game than Saints Row 3 though. The first thing that can be said are that the powers are excellent, basically it's Volitions version of Prototype. I know Crackdown's been mentioned but but it felt a lot more like Prototype to me, especially in the traversal after getting most of your powers/upgrades etc. The one thing to me is that the story seemed very 'slight' in this, almost like just a bunch of skits/crazy levels just very loosely strung together. It was definitely a lot funnier than SR3 though, some parts had me laughing out loud, even some of the general dialogue when being attacked 'Aim for the mascot!' I do admittedly miss some of the pitch black humour but they obviously wanted to go more 'silly' and that's fine. If you've played 2 and 3 I think you'll get more out of it, there's a lot of references and characters etc from those. It's almost like an injoke game at times just for the fans.
I also honestly can't think of any other game where a question mark fucked me up.