I never traveled on SU but I have used their lounge at the old SVO airport a number of times. It was tired and dark and at one time was mostly smoking, which permeated the entire lounge. I don't remember crowds when I used it before KLM flights, but the food tended to disappear as soon as it was put out, especially the smoked salmon. Breakfast foods looked dry and stale, totally unappealing but they did have Russian sparkling wine and imported mineral water.

This arrangement had pros and cons compared to the former lounge arrangement which was to give 15-20 Euro coupons for the Irish bar across from the gate, good for food/alcohol/souvenirs and hard to spend the full amount unless you wanted a T-shirt or something. Irish coffee, their specialty, was cheap.