There might be a little bias because I'm a huge Damian fan, but out of the three, I enjoyed Morrison's run the most. The only thing I didn't particularly like was his portrayal of Talia (I used to be as adamant about BruceXTalia as I am about him and Selina now) but I got over that years ago.
Snyder...I actually don't remember a lot about his run aside from Death of the Family (which I enjoyed well enough but didn't really think it was anything great). It was during a time when I sorta fell off with comics.
King though....oh man....oooooh King. I used to be one of the people who defended his run, tooth and nail. For a while I actually did like it. But damn has it gone off the rails, HARD. He is slowly making me hope I never see Bane again after this run. The Batcat stuff was good (though not always well written, thanks to King's annoying fetish for symbolic repetition). A lot of the filler stuff was pretty good too. But he never fails to lose me whenever the story goes back to Bane's drawn out and convoluted plan to once again "Break the Bat". It's just not very fun to read when the same **** keeps happening. And considering that's supposed to be the main draw to his run, I'd say that's pretty bad.
Like today's issue for example. Yet ANOTHER chapter of Bane kicking Bruce's ass, juxtaposed with some narration in the background that's trying to be deep. At least I think that's what it was doing this time. Once I realized I was in for more of that ****, I just started skimming.