Without being elitist it is only a Cafe! If it was setting itself up as a Bistro or a Fine Dining club then I would agree with you but it's a bog standard cafe in a museum.
Had coffee in their on Fri and found it pleasant enough.
Perhaps "stellar" is too strong a term, conjuring up 3 Michelin star standards and all that but why should it be "bog standard"? The museum's not. Its a jewel. I'm just suggesting its cafe should be recognised for similar qualities to the museum - expense not being one of them.