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After a while we could post this on Infinity Ward forums to see if any of them pick up on it.

Mine would be:
[PS3]
Host Migration.

1. Sometime it dont even migrate ! it just kicks everybody.
2. Migrate's to a worse signal.
3. TWICE now iv had a kill streak (Chopper Gunner and Harrior Strike) and when it migrated it reset my kills and deaths to 0 !
4. Kicks your team mates or puts them on other team.

Invite System

We all loved the Call of Duty 4 invite system so whats wronge with it?
With the new one my inbox just gets packed with message's for invites to MW2 and when i have alot of message's when i try to read one it freezes my ps3 !
If you have a poor connection sometimes you dont get the message for about 5 minutes which is rather stupid.

Guns
M9~Silenced still shows up on UAV.
RDS on FAL is off target.
Model 1887~Akimbo~FMJ is still over powered with range

Spawn System
Not sure about any other game mode's but i only play Hardcore HQ, and on 90% of the maps you only spawn in about 4 places.
I was camping on Afghan and the other team spawned behind me HOW STUPID !

Maps
Same again on HC HQ !
They is a total of 16 maps, and only 12 are played in HC HQ.
Why carnt they just have every map?

Trust me i think if these couple of things were fixed the game would be a 100% better !

Now what would you like?

I would like them to fix the commando no falling damage cuz that's unfair

They need to fix the spawns, knifing, host migration and the join session

Keep the 1887's how they are, now you have to sacrifice marathon or scav but can keep the awesome sauce. **** THE RESPAWN SYSTEM, it sucks, a lot.

Invite system.

When you do join session the game should treat it as if it was a party granted that it can put you on the same team as your friend. I hate joining a session and getting split up from my friend right away.

Has anyone noticed that the strikers have redic range after the other patch. They beat out the spas and 1887's now.

LET US HAVE RUST MORE OFTEN, bring it in FFA more often, have some domination and HQ I have played like 3 FFA's on it and I only play Demolition and Domination outside of FFA's

-in the pre game lobby, able to choose what team you want and game does not start until majority of people press start (as in they are ready) but game starts automatically after 1:30 seconds.

-sleight of hand pro: able to switch between weapons faster + (what it does already)

-snow doesnt show up as white while looking through thermal because thermal detects heat and snow is cold.. fail on IW's part

-able to skip the game winning kill cam with majority vote.

-match making does not put you into games that have already started.

-and everything else that was said ahead of me

IF everything here gets fixed, i will never complain about the game EVER again

demolition spawn system - sucks
fix host migration
fix thermal scope on snow maps
fix F2000 recoil
fix mp5 recoil
make the care package speed normal
give an option to disable join session in private matches, or an invite only option

1. Just say take out the 1887s model (i mean wtf) they are fine like that. Or you will have to say, balance the AK47, the SCAR-H etc... (if they kill you too much it, just use it is that simple)

2. Invites are fine like that, I mean why people have to invite you 10 times? this is not cod4 where you get an invite, and if you dont join fast, it will say "error" (people were complaining about that in cod4, that why they didnt put it like in xbox (same as mw2) and now when they put it like that, is a problem anyway)

3. Simple and easy... just the messages by people, not the invite too... what I do is read the message, and then delete all the messages (including invites) and BOOM your inbox is clean... Just go to XMB > Friends > Messages, ad from there you will delete all the messages in one go.

4. 1887 are now balanced because if you want to use them, (overpowered like you said) you will have to take bling, which means no marathon, they will run slow. Just like like marathon and scavanger, if you want to take it, you will have leave marathon.

I agree with the other things that you said
But sometimes i think that if you think that a weapon is overpowered then why you don't just use it?

not allow noob tubes in spawn on s&d

Fix how when you kick someone, they join because their friends are in the party -.-, like when they get kicked 3 times they arent allow to join for 1 hr..