I felt terrible about killing the legendary beaver. I didn't like killing some of the others, but something about the beaver got me. I think it was that he was just building his dam, minding his own business, whereas a bunch of the others are bears, wolves etc which will actually kill you.
I got killed a bunch of times in Saint Denis running along the docks and rugby tackling and stabbing people one by one. Also managed to get Valentine completely locked down and killed a ridiculous number of lawmen and bounty hunters whilst holed up in the hotel. I couldn't even close any of the doors as there were so many bodies piled up.
It's not quite as chaotic as GTA, but still really fun.