Dust to Dust
This is it. WW3 is over, but Makarov is still in hiding. It's time to tie up the loose ends.
As you should have noticed, Price and Yuri are both in juggernaught armor. This is really good stuff, and can protect you from just about any damage from the front that's not a headshot. And you've got heavy machine guns. This should be interesting.
Walk toward the hotel while firing on Makarov's private security. The first wave should fall before they know what hit them. As the second wave responds, just fire on their moving cars to blow them up before they cause you much trouble. Engage the scattered survivors near the entrance, then watch for the civilians to flee.
As you move into the lobby, you'll come under fire from two groups of three that come down the escalators. Just hit both groups, and then follow Yuri up the left escalator. As you go up, the balcony will be lined with guards. This is actually one of the few dangerous spots, since they have a really nice angle for doing damage. Clearly shoot the one above you on the escalator, then crouch and fire on the rest of the row. After you've cleared them out, reload (you should be fairly low on ammo by now) and keep walking.
As you get to the top of the escalator, face to the right. If you don't kill the guards to your right now, they'll easily flank and kill you. If you gun them down now, then the next part is easy. Keep walking toward the elevators with Yuri, and fire as you go along. If you keep everyone in front of you, then you'll be fine. As you reach the elevators, hold your fire to avoid killing the civilians and then step inside and reload.
When the helicopter shows up, just start shooting. If you can, pour a lot of fire into the rotors as it climbs up to fire on you. This is when it's most vulnerable. After it's taken enough hits, it'll crash and ruin your armor. It was nice while it lasted, at least.
As you exit the elevator, shoot up the first small blockade and note the timer. It's actually not that tight, since you just have to find Makarov in the restaurant within that time frame. You should be able to do it easily in less than 2 minutes. Cut to the left to the room with the poker table, and use it for cover to kill the two or three guards that should come in.
Go out the back door and stick to the left side. This wall will prevent them from flanking you, and it's easy to keep a couch inbetween you and them. As you move up, just keep picking off the guards until you see the skybridge to the restaurant. Run across it to stop the timer and bring up the final part of the mission.
Engage the last of his guards until the helicopter makes its attack run, then climb through the wrecked path to reach the helipad. Jump off the edge to grab onto the helicopter, and cause a wreck. At this point, it's just a matter of beating the quick time events. Hit the keys on the screen quickly to finally bring things to an end.
And with that, you will have officially beaten Call of Duty: Modern Warfare 3. Congratulations!