Believe it or not, Cryo ammo was a god send for all Adepts that want to maximize their biotic combos. They don't mess with biotic explosions and help a lot with crowd control. Disruptor or Incendiary ammo just screw any BE so it's out of the question most of the time.
I don't think that is a fair comparison, when you could've mentioned Warp and AP ammo for a BE heavy Adept build. Unfortunately only Phasic Rounds had a real useful function beyond simple damage output increase or priming. CC you mentioned was pretty meh, because it only worked against a bare health, so that pretty much excludes everything but the cannon fodder mooks, which should die almost instantly, and which you don't have to be very careful against anyway. The enemies you need to watch out for are either immune against it, or you have to strip their shields or barriers first. Usually it tends to be half of their overall HP, so at that point you might just want to finish the job instead of just disabling them.
Still I liked to use Cryos occasionally, the effect was pretty gimmicky but amusing. For the effectiveness sake there was always a better option, no matter what build. So, I can understand if anyone's soul was torn up a bit every time they got two IVs from a Premium Spectre Pact. But isn't this issue solved in DAMP by crafting? So far all the examples I've read about crafting and breaking items and salvaging their components have been about weapons and armor, but it would be strange if the system didn't include useable items as well (there's always been crafting for those after all). So, hopefully when RNG gives you Explosive rounds III, you can just break it into tiny pieces. 
It all depends on how you use the ammo. Cryo ammo is good at crowd control on health and reduce a bit armor. So what do you do with that?
For example, a Fury with the Acolyte is the harbinger of destruction combined with Cryo ammo IV. You get Anihilation field up, run in an enemy's face, one-shot its shield with the acolyte then use throw for a biotic explosion.
If the enemy is health only, or health + shield, he will freeze giving you more time to fire the biotic explosion or at least give you a better chance of not being hit by a stray bullet. Since the acolyte can hit more than 1 enemy at a time, you can lock up a small group by freezing them. 1 biotic explosion and they all die because of the blast. Chain a couple of those in a row in Platinum and you'll see waves of enemies melting in no time.
If the enemy has armor, or armor + shield, he will be chilled a bit and receive more damage because armor will be reduced. Since Cryo ammo doesn't always proc on armor it won't interfere with your biotic explosion anyway so you're fine to kill any enemy in 1 combo except for bosses.
What would have happened with Disruptor ammo. Well, you're screwed because it procs like crazy meaning instead of doing 6000 AOE damage from a biotic explosion, you do only like 500 in a much small area. If you ran into a group, well you're dead.
With Incendiary ammo, it's less harmful because it procs almost just as much as Disruptor but the damage is like 3000 and the AOE is about the same. You get the stun from the explosion and you usually kill everything but not always. So it's not ideal.
With Phasic, well it's worthless if you use the acolyte, even Explosive ammo would be better in that case. Let's forget about those 2 shall we.
The only remaining ammos are Warp and Penetrating. If you're using the Acolyte you can 1 combo anything at all difficulty in 1.5 seconds (except bosses). Nothing else will give you that, especially because you have the AOE stun and damage from a biotic explosion. Since the Acolyte's damage is minimal, both types of ammo effect will be minimal too. It won't be detrimental, but it won't help that much either.
I've just given you 1 of the best build with Cryo ammo, but I use it just as much with the Drell and the Human adept with similar results. Of course, it's not as efficient as with the Fury, but nothing can come close to a well played Fury.
That doesn't mean Cryo ammo is for any build, but it's usually pretty good with adepts if you're trying to use their power instead of using the biggest gun around (in which my philosophy is to use another class, you don't use a mage to wield a 10 foot mace/500 lbs gun).
Incendiary and Warp ammo are amazing with certain build, as I said it all depends on how you use them.