Had to check this place out while I was visiting MKE. Overall it was just alright. Really not as amazing as the reviews make it sound.
Service: I sat at the bar, had decent service. It was my first time visiting this place or MKE and the guy behind the bar didn't really go out of his way to help me out.
Food: Better than your chain restaurants or most bar food. But it wasn't the most amazing meal I've had. I had their "famous" meatloaf sandwich. It was just alright. Not very much flavour to it, overall it was pretty bland and a little on the boring side. I also ordered their homemade cupcake and again nothing special.
Value: Just about average.
Atmosphere: Their vibe was about the best thing they had going for them. Cool decor in the building, definitely resembles a old school cafe.
Overall the Comet Cafe is probably worth checking out if you are in MKE. But it wasn't what I expected.