Seamus McCaffrey's is one of the top dive bars in the downtown Phoenix area. There are several reasons why:
It has one of the best, busiest (and cramped on the weekends) patios in Phoenix. It is likely that if you arrive later in the evening it will be difficult to procure a drink or a spot. However, do not give up, with a little practice you too can learn the "Seamus Slither". This is a concept of my own invention where you must slither through the crowds to reach a good spot on the patio. Usually the bros are kept out so there's little threat of unpleasantness.
Some people have mentioned that the bathroom is not up to par, well, it's a dive bar so get over it. The bathroom is towards the back and up the stairs, have fun.
Another great thing about Seamus is that it is in the middle of what is starting to become a bar district on Monroe Street. It lays directly across from the alley leading to Valley Bar and if Cornish Pasty ever opens it too is on this street. This bar is also one of the best hubs to pick up a pedi-cab (or regular cab if you're into that) downtown.
The food is average, it's really typical bar food but I love that the kitchen stays open really late (I'm not sure what time they stop but I've stumbled in well-past midnight and was served). The fish and shrimp is my go to.
Drinks are typical downtown prices... I don't know, I never bother to ask how much I'm paying for drinks.
PEDI-CAB!