We rolled in around 11 for brunch at Le Cartet during a recent vacation and were seated after about a 15-minute wait. Very tasty; I went with the Brunch des Cantons, which had a ton of meats in a skillet with some eggs and potatoes. Not earth shattering, but very solid and makes me think I have been getting Canadian bacon all wrong! Had this with a mimosa on the side and one of their croissants. I'm not sure I would need to run back here, but my experience was fine and my wife seemed to enjoy herself also.
Picnic table-style seating will turn some people off, so if you want a "private" place to eat, Le Cartet is not your boy. Our service was great, but at the table next to me, the couple who sat down right as we sat down didn't get their food right away and were just getting their brunches as we were leaving. I'm not sure if that level of inconsistency is normal, but I saw it first-hand!