Here are what I found to be the most troubling areas of the game:
1:Group fights (You vs. like, 20)
2: Driving missions where you're out the sunroof with an mg.
1:First, you should find the Wushu dojo and find the "spinning jumpkick radial attack" (a+b attack or whatever the hell you want to call it)then when you're in a large group fight, continue to use this attack. its unblockable, more powerful than the basic radial punch, and knocks enemies down every time. then once theyre down, kick them or strike them with a weapon while they're down.Also, even when you think its all over and you're really pissed off, its not. look for health packs on the walls when you're low on health. they're almost always there and will give you the upper hand in a fight.
2:These missions are tough because there's no health to get, but dont worry. you will find that the car is much more durable than usual. Know I know, these fights seem endless but keep your cool. use L-targeting alot, especially when black smoke starts billowing from the car (This is almost inevitable)
3:For gunfights, use a similar strategy to fighting. the key is healthpacks. like I said, they're always on the walls. Also crouch alot and get behind something.The trick here is to do the back-to-wall thingy. this gives your enemies a much smaller target. But make sure that you NEVER, EVER USE GUN DIVES. thes put you out in the open when you finally land, and its nearly impossible to aim.(plus you can only get like 2 shots out) Just follow these strategies and you'll breeze through the game in no time!
I hope these are helpful to everyone!