I updated this last night after not playing it for,ooohh, 6+ months - 3.8 gig update file and loads of battlepack things!! Anyone else in a similar situation TAKE THE BF4 DISC OUT FIRST!!
It crawled for the first 30 mins and I thought, "stuff this, I'll pause this and put Destiny back in". Luckily I ejected the disc first and the install started roaring away!!
Having said that trying to snipe and blow things up with Chris, Chip and Sam was good fun but the (re)learning curve may be too steep for me to return to this on a regular basis