I wouldn't be put off, especially if you have noise-cancelling headphones. Seats 70A/K and 80A/K are the 4 best economy seats on any BA aircraft (by some distance, in my view). If you can get these, go for them... though be aware that this might be tough late in the day, due to the Theoretical Seating tool giving a lot of assistance to gold card holders who could well have reserved the adjacent seat (depending on the loads etc.)