They produce the same end essentially, a cap on the number of times you can use a power or the weapon in any amount of time. They are not very dissimilar given the amount of ammo that is actually in the game.
It is only in the very fringes of hypothetical that the cooldown for powers allows you unlimited power use in a mission. That mission has to have unlimited length, which doesn't really even make sense. Practically speaking, how long does it take to do a mission only using your powers, not using weapons, and hiding squadmates where they do nothing? It isn't even possible to finish a mission with some powers (like Overload) since they will not actually finish all enemy types.
Powers are subject to cooldown among all squad members. Only Shepard is subject to ammo limitations.
Cooldowns happen automatically over time - all you need to do is wait. Refilling ammo requires the player to chase down an enemy drop or find fresh clips planted somewhere in the level.
Weapons can be used versus any of the 4 layers an enemy presents: barriers, shields, armor, health. Some weapons are more effective versus some of those layers than others, but every weapon does some damage against any of them. That isn't entirely true of powers - a shielded enemy will walk right through a singularity, taking minimal (if any) damage.
Why would Shepard attempt to use an SMG to strip shields from a long range enemy instead of using her perfectly good sniper rifle w/ disruptor ammo? Oh, right. Because the sniper rifle is out of clips.
As I said, I had no problem. Maybe its because my Shepard can adapt and overcome without worrying about running out of ammo.
So can mine. I just can't RP the type of character I'd like to RP, because the mechanics won't let me.
For this reason, I find it unfun. And I've already said all of this multiple times in this discussion.
Did you actually read the post, or you just take this as an excuse to insult him?
It's the BSN way. Don't read what a post actually says, or read a bunch of stuff into it that isn't there, so you can snark at the poster.