Marche is ok, but like most, I have my complaints. The usual tip thing but they didn't really do anything.
When its busy, waiting in line for the Rosti, and watching them cook other people's rosti slowly, before you can place your order. But if you get it with the sausages, its fantastic.
Also, if you get the rosti, and then you have to wait elsewhere for other food to cook, you food can get cold.
I find it quite cheap though at lunch compared to other restaurants of similar reputation.