I would agree that the SEN lounges in FRA are disappointing. Crowded, not much food, long waiting lists for shower (even for paid F travel), just not what you would expect from a First Class Lounge at a home airport of an airline. But still not the worst....

For me the Lotus Lounge in CMB is the worst(SQ is using the lounge). It stinks, is dirty, filthy. No windows. The food looks like it is sitting there for days (cooked food kept lukewarm - ideal for all kinds of bacteria growth). They have a guest book. Most of the coments are extremely negative.