Hmm I was there about two weeks ago and didn't find that to be the case. The two hot selections were pasta and a chicken wrap, both of which were very delicious.
With that being said though, the lounge was fairly empty, no more than 10 people in the lounge at once.
We were offered the option of breakfast in the restaurant or lounge as well.
Staff at the Marriott Cologne were definitely top notch though!