I love this place. Truth be told - I love diners in general. But Hubbard is great - I've tried it for brunch, for dinner, and for pie of course.
Brunch - I'd have to say you can get better brunch other places in Madison. But they do a decent job.
Dinner - comfort food. Definitely not fancy. I like the chicken pot pie.
Pie - is to die for. Especially the peanut butter silk/french silk one. Oh my god - instant food coma.
Service - always really friendly and attentive.
Environment - feels like a diner. Not too retro, but definitely still diner with booths and stools. It also has a tendency to be cold - at least in my opinion.