I was originally glad it was changed in black ops, but I'm actually looking forward to it returning back to killstreaks stacking.

It can get annoying yes, but I'm ready for a fast paced game again with lots of action.

Both killstreak systems have flaws tbh

Stackable - Easier to get higher killstreaks

Non stackable - Leads to more camping

I don't know how much truth there is in this, but I heard that only killstreaks you control count towards your next award. So getting a kill with a predator/air strike will get you closer to your next pointstreak, but calling in an AI controlled chopper might not. I guess we will have to wait and see...

i hated the way you had to earn your killstreaks in black ops specialy for a person like me who plays for the objective instead of sitting back racking up the kills and killstreaks i ran spyplanes c/spyplane and napalm most of the time with hardline pro

Killstreak kills only count towards your killstreak count if you use the Assault Strike Package. 

     I think that they will be adding killsteaks to killsteaks, because it was hard enough to get 11 kills on Block Ops, unless your just going to camp, and although doing objectives gets you closers towards killsteaks, you are also risking you life, so I don't see that being a major problem.

     Having them add to other killsteaks is nice, but at the same time is just adds to the camping factor since people want to just hide while their air support does that work. A cool new feature that they are adding though, is you will now be able to scroll through killstreaks, that way when your team has lots of helocopters up in the air, and you can't call in your killsteaks, you can just scroll through them and call them in.

When I first started playing MW3, I didn't like the idea of stacking. However, as I played it more, it fits very well with the loadouts. Considering just the action of calling in a killstreak can get you killed and ruin your streak, that risk alone warrants it adding to your streak.

A good portion of these killstreaks even give the enemy team a few seconds to prepare or destroy the streak before it even lands or kills anyone. This is how preds get trophied, choppers get blown up before they even make it to the war zone, etc. So how much that killstreak actually adds up for your enemy is all based on you.