All they'd have to do to make Ret 100% more fun to play IMO is adding the WoD version of Final Verdict (that gives a buff to the next Divine Storm) instead of the current one that just buffs TV damage on Tier 15, and adding Empowered Divine Storm as one of the Tier 60 options (we don't really need two different types of buffs to Blade of Justice, do we? Roll them into one).
I'd pick those two talents (plus Fires of Justice) without ever looking back, and Ret would be fun to play again.