i'll help you with the parking lot shootout:
Spoiler Alert! Highlight to read. this is one of the very hardest missions in the game because not only do you have to kill the initial waves of enemies, you have to also escape down all 4 levels of the garage, and each one is filled with enemies.
the initial firefight is relatively easy compared to trying to escape afterwards. to beat the first wave: make sure you run AHEAD of your AI friends. they can't get in your line of fire if you are IN FRONT of them. you have to be the one taking charge. USUALLY they will stay behind you if you make a PRONOUNCED effort to get in front of them, although sometimes you still have to watch where you're shooting
crouch during your shootout to make you less of a target. use cover when you can. most importantly, target the enemy cars that are blocking your path so that they blow-up and take out a ton of the enemies at once when they do. a good trick is to keep the cars from blowing up until the SECOND WAVE arrives - blow-up the cars JUST as the second wave is entering the scene - and you have a lot less work to do.
now, you have to escape the parking lot. you can TRY taking a vehicle, but every time i did that - i got blown up. the enemies on the way out have thompsons, grenades, shotguns - you name it, they got it. so getting out with a vehicle may prove quite difficult, although doing it on foot is no cakewalk either.
i did it on foot by crouching as i moved, and being VERY CAREFUL as i crawled down each new level... always trying to pick off as many guys as possible before going more than HALFWAY down each ramp; once you're more than half-way down a ramp, you lose your cover and are a sitting duck.
one or two levels down from the initial shootout, you will find a much-needed healthpack in a "caged-in" fenced area.
best advice i can give is to take your time. DO NOT use the stairs to try to escape, and be as careful as you can. it took me A LOT of tries to get this Mission beat and i'm pretty good, so you are likely to die a few times on the way down unless you're a super leet gosu player :)
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