I've lived in Phoenix since 2005. This is one of those places I drove by for years and years and years wondering how it stayed in business. It's super basic and has this big Mr. Submarine sign. In fact, it wasn't until 2014 that I finally was just like, "you know, I want a sandwich, let's check it out. I bore of chains easily and I didn't want something from Sub Factory and variety is good." (I talk to myself in lengthy run-on sentences).
But, damn, Mr Submarine has good subs. I LOVE their italian sub. Whether its the 3 kinds of ham they use, how mom and pop it is or their pickles, its the best submarine sandwich I can find in this part of town and I make it a point to grab one whenever I'm nearby now.
So yeah, stop at Mr. Submarine, that sign wore me down eventually.