I have been living near this place for last 10 years, and I visit it (and sister Kolbasoff @5th Avenue) at least couple dozen times a year - usually for business lunches and dinners with a friend or two.
The best thing about Kolbasoff is that they have consistently good food quality - all the time and over the network. Prices are a bit higher than in other "beer places:", but still moderate.
Beer selection is OK, service is good (and the management resolves rare issues quite professionally).
The only recommendation I can think of would be to order stuff from main menu - the seasonal dishes are OK, but not as good as their "old" recipes.
(Another advice for this venue: if you want to watch football game, try to book table at Kolbasoff in 5th Avenue nearby, as it has better atmosphere).