Chapter 5 - Annoying as fuck sequence about 2/3 of the way in, almost made me turn it down from Hard, I gave up last night but did it first time this morning.
Chapter 6 - Just awesome
I'm finidng there are parts in this game where you have to play it like a trial and error game. Each death you make it a little further so that the next time you know what to expect, but then something new catches you off guard and then you repeat until you know the area, positions etc
It's annoying tbh as MP was never about Cover shooting, but Rockstar seem to have made some parts of the game nigh impossible to get past unless you stay in cover, blind firing, waiting for them to move etc; I have yet to go down that route and i'm sticking to my principals of shoot dodging, bullet time and suicide which is probably why i've died 123 times. Surprisingly i've killed over 1000 guys now......