I ate there maybe several months ago. I was surprised by the lack of ambience but as I recall, the food was excellent. I had eaten at other LM places over the years -- and one thing I've found at each one was excellent food.
I remember that the French Onion Soup was very good -- sometimes it's too sweet and this was spot on and had great, lovely, melty, strings of gruyere. I don't recall what I ate for a main -- but we a really nice rice pudding for dessert -- or tergoule.
The service was less successful. While it was prime lunch time -- the place was pretty empty and yet there seemed to be a lack of understanding about what waiting on a table was, really. We asked for things that never came -- we waited and waited and I believe at one point, I got up to go fetch someone for something.
While the food was good -- the service did not work for someone who only has a finite time for lunch. I might go back again if I'm down in the south loop -- but not if I had a time crunch.
Anyhow -- that's my two cents and please remember that it was several months ago. Service problems may have been solved by now.