I haven't watched the video yet, but on the topic of chaining killstreaks.. no.
I dislike MW2 & 3's way because
1. it takes no skill to get a lot of kills.
ie. I equip hardline and start up a game of domination. I capture the home flag and make my way to a spot that can easily pick off people going to B. I get 3 easy kills and have now earned a predator missle. I then retreat back to my home flag and call in my predator missle. I get a double kill and now I have an attack helicopter. My attack helicopter proceeds to earn me 5 kills and now I have a pavelow. I just went from 3-0 with 1 capture to 15-0 with 1 capture. Sure you've got 15 kills, but a teammate could be 15-8 and have 4 captures in this time.
2. it creates way too much air support.
ie. 5-7 UAV's per match, 5-7 Predator Missles per match, 3-7 Attack Helicopters per match, 1-3 Reapers per match, 3-4 CUAV's per match, 2-3 Stealth Bombers per match, 2-3 EMP's per match.
3. it causes people to not play the objective.
ie. people are playing to earn killstreaks rather than playing the objective. this is seen by people camping in corners or sitting in the back of the map when they only own 1 objective, or if they have 2 at the moment but the objectives have been consistently changing hands. These people who are simply trying to earn killstreaks will do little to defend or capture because they are scared they will lose their killstreak chain.