I didn't think the SQ lounge was that bad, although my expectations weren't high as their main lounge in SIN (before the new terminal opened I think) was surprisingly ordinary. When I was there the tv was on silent, the staff extremely warm and friendly and hardly any other people there. Thought the food options was pretty good too, considering the facility is at an outstation. Compared to the zoo that is T3 shopping centre, it was everything I needed. I agree that BKK is great for F pax. Just a pity about the most important bit, the TG in air product!
p.s. Agree about TG T3 checkin staff. When she mentioned going to the SAS lounge I said I thought i could use SQ F lounge. She looked confused, I explained the Star F policy thing and she replied "oh, well I suppose you can give it a try' Mmmm.