Of course healing will not look too strong if you isolate it from all other forms of utility, but you can't look at stuff that way.
Your argument looks pretty good on paper, but if you log on and play some arena you will notice why people are complaining about ret paladins. And if you still don't, try playing something else than ret and then come back.
People are complaining about Ret because they're not used to deal with it.
Healing can help keep people up but can't stop a healer to land a kill, CC can do that.
Our conversation got to the point where we conclude: specs have strenghts and weakness. Ret have defensive utility but the only ofensive is the burst/stun. The dispel for the healer is to compensate for the lack of peels and self healing - not to mention we trade most of our DPS for healing with WoG and if FoL get interrupted we can't even bubble. After bubble Ret is dead meat. You can pressure to get 2 sacs and 2 bops withing the first 2 minutes of the fight real easy with the amount of CC that a Mage/Hunter/Rogue have and then, what can the Ret do? Stun you so your healer can keep dispel, just so he can say he'd done everything he can. Maybe a couple of WoGs but that's it. And if you played MoP you know it.
People are just used to have ofensive utility dominating everything and now they toned it down so defensive utlitiy shines. When people eventualy learn that if your fight against a Ret lasted for 3 mins and he spend his bubble, it's just a matter of coordinating CC and dealing sustained damage and win - then people will see how much they're overreacting.
People say Ret burst is faceroll because all he need to do is deal damage, but when people facerolled Ret burst just chaining CC him it was OK. No bias, right?
Now people have to actually have skill to kite/CC and use defensives right when Ret burst. I agree that with 50% CC reduction this could be too hard, but 80% of Ret ofensive utility is just that if it's easly countered then the spec is dead as it was on MoP.
So make it a 30% CC reduction and let people deal with Ret burst and defensive utiltiy. Most comps have the tools for it.