In that seat, you have people walking by (even though this is not too frequent) in Business Class anyhow) on both sides of you. And, IIRC, there used to be some kind of trolley placed in front of this seat during cruise, so people will be standing in front of you frequently.
Overall, this seat got / gets mixed reviews f.i. on seatguru.com.
I liked the old AC 2-2-1 layout (or 1-2-2 on.ex-CP 763s which had the single seat on the left side) better than CO's current 2-1-2 on 762s and 764s with the single seat in the middle (a couple of other carriers including AZ are also 2-1-2). You thus have traffic in the aisle on both sides. However, any 5-abreast J layout on 767s is much better than 6-abreast like DL currently.