First off, I'd like to say that I like the 5.0 Holy Paladin. For the most part it looks like it will play the same as the 4.2/4.3 Holy Paladin, and that's good. However, I have a small concern, and that is the fact that Hammer of Wrath is going to be Retribution-only.
Hammer of Wrath is an extremely fun ability. It always has been. I remember when it was first introduced, and it has always had a spot on my bars since that time.
It's definitely not a necessary ability for Holy. But you know, when it's the end of a tense fight, down to the last 10% with the enrage timer coming up, being able to throw a few Hammers of Wrath at the boss is extremely fun. It feels like you are contributing even more. It hits hard, but has a cooldown so you can't abandon your healing.
I don't really know how to phrase it well. It's the perfect ability at the perfect time. Our dps is terrible, but when things go down to the wire, Hammer of Wrath allows us to step up, like the ace up our sleeve.
I'm sure every long-time Holy paladin has a story about the one time the boss hit enrage with 2% left and people were dying left and right so you bubbled and flung a Hammer of Wrath for the kill.
And even if you've never done that, there's always the hope that someday, somehow, it will happen. That you'll need to step up and drop the boss with Hammer of Wrath.
Even in PvP, it's quite fun. I've always enjoyed sniping killing blows with Hammer of Wrath.
I guess I'm just saying that as a Holy Paladin I love Hammer of Wrath. I know it's not essential to healing, and may even cause small balance issues. But it is just plain fun, and I think the spec will be poorer for its loss.
I urge Blizzard to consider giving Holy access to Hammer of Wrath in Mists of Pandaria.