Vats is one of the best parts, especially with the bloody mess perk.
Get a lot of AP and use a sub machine gun then target someone 5 or however many times you can in Vats then BLAM!...lots of fun there.
I also started playing a new campaign not too long ago...I should pick that up again one day...
Oh Noo! I couldn't do that. I cant even look at the screen when I kill someone. It goes into slowmo and their head and limbs pop off while squirting massive amounts of blood. EEEW! That bloody mess sounds like it would just make it worse.