I might have to ask them about that next time, as I think it's a lovely spot that does the basics really well, and so I've decided that it should maintain its HOT rating.
Enroute to the bathroom I also discovered an upstairs function room which seats 30 on a long wooden table, with the trees of Bourke Street casting dim dappled shadows over the large sash windows. I will just have to make up a function so that I can use it one day - maybe I can pretend I'm turning 30!
Update 4 April 2009: Desperate for sustenance after hauling ass here, there and everywhere for house inspections, I ducked into Mess Hall for some hot cross buns. Unfortunately, I was not too impressed - there was no cross, the top had an incredibly stick glaze as opposed to my favoured crispy top, and my bun had minimal fruit and maximum dough (although RM's bun fared better). An above market rate $3 per bun too.
Update 21 May 2009: Finally! Mess Hall has fulfilled its earlier promise by delivering a delicious arancini salad for lunch. Mama Mia delightful!