Not really a BA lounge, but I always avoid the lounge at WAW airport in the Shengen area. If I have time I use the non-Shengen one (which is better in terms of space but still horrible for F&B) and then make my 10 min way to the gate.
ARN also very disappointing, I tend to retreat in the restaruant just next to the lounge.
NCE so so. Indeed quieter than the low cost style waiting area downstairs, but overall cleanliness and F&B leave much to be desired.
And finally, when I was Silver I frankly avoided the LHR GC lounges in favour of Plane Food.