I'd say there is a fair amount of luck involved in this fight, but as you keep practicing you'll notice it gets easier and easier to dodge the bombs.
What I generally do on my 4 ret pala + DK team is always try to stay together in front of the boss. I'd not go as far as saying its a safe spot, but I very rarely see bombs land on top of my team.
When he is casting those rocky spikes in 4 direction, thats a really good time to try and regroup if your team got scattered.
The rest is pretty much strafing and backing away from bombs. As I said earlier practice and luck helps a lot.
Here is a totally unedited video of me doing the fight today as part of the random daily heroic:
http://www.youtube.com/watch?v=_Fh3ulFMfaQ
Hope this helps!
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