Three point five. It's a good pub atmosphere, and clean too. All sorts of music playing, I heard a good amount of industrial. They've got a wide selection of beers, although being underage the most I got was a couple sips of my dad's Steam Whistle (which was pretty good). Service was friendly but a bit slow, and they forgot to bring my dad his beer.
I got the buffalo burger. It was seasoned well but I should have ordered it slightly more rare. Buffalo meat is far leaner than cow meat (tastes the same though) so you lose those nice greasy juices. The barbecue sauce that came with it was too liquid, as in it could have been thicker. The fries were great! I had mine as poutine, which for the uninitiated are fries with gravy and cheese curds. They're delicious, although slightly bad for the arteries. But to quote something from the menu, "A diet is a way to starve yourself so you live a few more years." The regular fries were also tasty.
Overall I enjoyed C'est What? and would recommend it to anyone who wants a good pub experience with some good food. Be warned, it gets expensive: ran about $85 for four people.