During warpriest yesterday I had 0 ammo for all my weapons and not a single add dropped one ammo brick of any kind. Strange? I'd say so.

I think you might've just been lucky. I went an entire nightfall seeing only ONE single green brick drop for the entire strike. One brick, in a NF with Specialist modifier... :D I've never experienced the drought quite like that, I had to use 4 special synth in one run...

I saw exactly ZERO heavy ammo until I used all of mine. Then I had 4 bricks drop from one group of ads. Can we just have our reserves back? Seriously, Bungie, this is purely asinine. You took away reserve ammo for no good reason. Give it back!

Maybe a stealth buff? After the ammo nerf Bungie claimed more ammo would drop in PVE. I personally didn't notice any difference.

More detail... I was running Nightfall. I fought my way up the cliff because I needed special and heavy going into the next area. I killed everything, nothing dropped. Not one crate. Great. Gonna be one of THOSE runs. Moved into the cave, knocked down the ads (thank goodness my Hung Jury is 335!). Maybe three crates in the whole area. Mercifully I was babooned out at that point. I wouldn't have quit out of morbid curiosity, and it would have been a lot of wasted time. I just shut the game off and found something else to do. I'm not going to pop synths to take care of a problem that shouldn't be a problem in the first place. Hell no! Bungie screwed this up, either intentionally or because of incompetence, and they don't need us to bail them out with a workaround that increases our grind. I'm sorry, but that just encourages them to do more of the same.

I've noticed more ammo drops in PvE, especially in CoE and Strikes. At this time, however, I can't tell if we're the lucky ones or the others are unlucky.