okay got some multiplayer (MTDM) in earlier. I went from lv 5 to lv18 and last time I played was the week of release.
some questions.
What did the update uh update? I did play some Spec Ops several weeks and there was an update (I guess it prompts it if you're signed on to LIVE)
I never realized how laggy games can get (and most of the time the lag is unnoticeable until you realize from the killcam

). I even lag out of a game just to reconnect as if I had just joined. It seems a loss is given if you quit or lag out. Do other stats count such as kills, deaths, scores, challenges?
How are the maps picked? Is it a cycle or something? I usually play one match then leave the lobby and join a new one. Since I'm playing MTDM atm, it doesn't really matter (and I rather play different people each time to see how gamepay varies).
How the hell do you take down vehicles? I tried using the defualt launcher (I wait until I hear that beep) to shoot down a heli and some plane but it misses

. And it seems some of the aircrafts kill me before I even fire the rocket (and the aircraft isn't really near me and is facing away according to the map).
I'm not that good score wise since I range from 600-1400 points a match (though MTDM only lasts 10min unless one team is stacked). What would be considered a failry average amount of points (depending on mae type I guess)?
I really want to improve my K/D (well up my score per match but kills gives the most). I had a k/d around 30% with maybe 10 games played. After I started playing agin today, my k/d is a bit under 50%. Atm I feel I do best with the "knifing" play style. I use the Scar and have the marthon, lightweight, and commando perks. I perfer the semtex frag. I use the flash bangs but might switch to the stuns. I don't really use a secondary (need to learn how to use rockets right). I usually have that default machine gun. I can't use that defualt shotty for anything. Im waiting to get a tac knife though. I need more perks until I branch off and use other classes (basically use SP, SoH, Steady Aim, plus the three I mentioned earlier for other "classes")
some tips would be great!