Reposting my review from Yelp. I made an account here after a year lurking just to critique my meal at L20. It was that bad.
This easily goes down as the most disappointing meal of my life and the biggest flop. I suspect part of it is the current menu, but to have even one menu this bad is really unacceptable at this price point and with two Michelin stars to defend.
First, let me say that the service was impeccable and the decor elegant. They even have comfortable seats which you will need for the four hour tasting menu. Also, while the actual courses were for the most part underwhelming, the bread service is fantastic. The rosemary croissants deserve to be singled out for excellence, but pretty much everything was great. Sadly, I don't go to restaurants to eat bread.
It's hard to organize all the bad that went into the meal. The progression of courses was awful. It's a blob of cold dishes, followed by a few warm dishes (not even that warm) and then four desserts. It was fatiguing eating that many cold dishes in a row and they were all pretty much horrible, but more on that later. Somewhere about halfway salvation came in a warm crab soup that was utterly revitalizing and the highlight of the meal. Ironically, it is served with an icy granita, a wonderful contrast pairing in any other circumstance than one where you have already bludgeoned your diners over the head with cold dishes.
Then we get more dishes that were lukewarm and then off to dessert which did nothing to relieve the temperature monotony. On top of that was a similar textural monotony as nearly every dish has some sort of jelly, gelee, or whatever it is called. Have you tried an iceberg jelly? I assure you that you do not want to. I felt like I was in a senior citizen home with all the mushy food being served. I was dying to use my teeth for most of the meal, to eat something crispy or substantial. For a seafood restaurant I didn't once even get a nicely cooked piece of fish.
Did nobody in the kitchen step look at the meal as a whole or even try the entire progression and see it was a mess? I can only conclude no because it was an egregious mistake that anyone should be able to spot.
However, I might forgive that if the individual dishes were good, but as you can probably tell, they were not. The first half of the meal was a dud with a vaguely unpleasant seafood mousse and a bunch of jellies. One dish was a deconstructed PB&J which tasted like separate balls of foie gras, brioche and something that tasted like Jello brand strawberry jelly. It was bewildering and not particularly good despite the foie gras.
As stated before, the highlight was the crab broth, but the warm section was in general superior with fewer jellies and a bit of texture. Still not at all up to expectations but at least somewhat pleasing.
Desserts started and I hoped that perhaps that with a different chef things would turn up, but sadly we were disappointed again. It started with a panna cotta with (another) granita on top and then some coconut creme. Everything was excellent individually, but the granita layer was a huge faux pas. It, ironically for this meal, added texture where there shouldn't be. I want to tasty the silky texture of the panna cotta and I certainly don't want the granita to immediately melt in my mouth and water down every bite.
Even the pastry chef couldn't resist the gelatin, adding it to a cremeux so that he could squeeze it into an unappetizing rectangular prism. Desserts were unimpressive despite often being a highlight at fine dining establishments. I give them points for serving a solid macaron, but they lose points for an ugly tasting chocolate. Strangely, the best sweet was the kouign amann they send home with you.
It was an uncomfortably long meal with courses taking more than ten or fiftenn minutes at times to come out. Obviously a long tasting meal will take awhile, but this is just excessive.
Sorry for the long review, but a 500 dollar meal is worth a lot of words. I cannot insist strongly enough to just spend nearly the equivalent amount on Alinea or even save some and hit Takashi or Mexique (my favorite one stars). The fact that this place retains any stars is a stain on the prestige of the Michelin guide.