I suppose they were just ordinary, and perhaps we're more used to seeing larger-than-life characters on screen? One of the things I liked about it was that a man who's supposed to be a big movie star ends up feeling lost and ordinary, just like the wife who's tagged along with her negligent husband. And for a brief time they click with each other.
To answer your original questions: no it has little or no storyline - not necessarily a bad thing - but it does have depth. If you 'click' with it, it has a lot of stuff about connection and disconnection. If you've 'missed' anything, it's that. It's a shame you didn't get on with it, I think it does have a lot to offer.
As I said earlier, I agree it's unfair to say people who didn't like it therefore automatically would like a Seagal action film. Also, people shouldn't be suckered in by 'hype'. If the film doesn't deliver all the hype promises, that's not the film's fault. It's just a film, and you'll either like it or not. Who cares what it says on the poster?