Tips & tricks for noobs in multiplayer

Don't know if the OP knows but I'll share it anyway in case it wasn't mentioned yet.

When consuming your thermal clip pack you get a 100% additive weapon damage bonus for 10 seconds and it stacks as well if you consume more than one thermal clip pack. Consuming your thermal clip pack also gives you an instant reload.

So you can do interesting things like for example:
Triple claymore via claymore shot, adrenaline rush for instant reload, then use thermal clip pack for another instant reload.
^ same trick but with the javelin.

Or you can do something insane which I think should theoretically work is getting off 9 shots of the AT-12 raider shotgun while using the human soldier by:
shoot the 3 shots off of the raider, adrenaline rush for another 3 shots then thermal clip pack then shoot another 3.

Also I said 3 shots off of the raider because using this gun off host makes you have an extra shot at the end after using the 2 shots in the magazine.
Using the AT-12 raider on host will only give you the 2 shots in the magazine.

Tips and tricks for noobs? That's easy. Pug Platinum/Collectors/Condor and git gud, son.

When pugging Gold or Plat, and the pugs feel the need to focus fire an Atlas, never, I repeat never, stand next to one of the Noobs, it will save you the embarrassment of taking splash damage from that inevitable rocket that will hit you(and cursing the gods as to WTF just happened)even though that scrubby Atlas cant see you

Never revive noob pugs who die anywhere but at your feet, unless you are working on Commando Mastery of 50 revives, trying to save pugs is nothing more than a trap to get you to use up more of your valuable consumables since you will need them to clutch all of the remaining waves for your assisted Solo, or the 4 man theme challenge, whichever applies

bed time reading

you might find this repository thread useful.

Never use explosive ammo. It prevents combos and is generally useless.

Edited for new information.

I seem to remember it was tested not to interfere with combos, but even so pretty much anything else is still better.

I once read on the old bsn that the detonation of explosive rounds triggers a praetorian's power immunity bubble. So even if it doesn't block combos, that alone would make it better choosing no ammo at all over explosive ones.

so no missile use in wave 11 ?.Why is that ?

On the extraction wave (11) you have two objectives: 1- Survive! and 2- Extract! Due to the unpredictable nature of spawning on this wave, you'd better abstain from killing stupidly and you should do your best to keep enemies away from the LZ. I can only think of two justified reasons to use a missile: to save your (or a teammate's) arse from a sync-kill or to clear the LZ in the last seconds (well, except when you have abombs=possessed abominations in the LZ when it's definitely not a good idea) . 
Everything else is just score-whoring and you should avoid the players who do that.        

docsteely Perhaps, but maybe do it solo/private. I don't care to join lobbies where I can basically kick my feet up. Granted, it's nowhere near as bad as a public hacked lobby though. Maybe -5 for each and 0 if 50 melee kills.

There, fixed