I too was most disappointed by the LH lounges at FRA, and most German cities like MUC and DUS. They are always overly crowded, both Business and Senator. I really feel bad for top tier and F passengers on LH, who at times must seem pushed aside with all the STARGolds who can use the Senator lounges. Argues for a third top tier level for STAR Alliance. Berlin TXL offered the best overall Senator experience, few crowds, good array of snacks and drink, and airy and interesting sight lines down to the terminal floor.