I ended up here on St. Patricks Day, because I need a true Irish drinking experience on St Pats and I was told this was the best PHX had to offer. And while this ain't exactly like being in Chicago, it'll more than pass for the middle of the desert.
First the annoying: cash only. We weren't exactly prepared for this, bubt made do. It was also a $10 cover and the drafts were all $5. Again, I can understand that this is their big money maker and I won't hold a grudge over it. It was still easy to get the drinks, and that's what really matters.
As for the ambiance, its pretty much what I needed. Everyone was drunk by the time we got there, and they shipped in someone to sing some dirges and drinking songs. This made Ayesha come to the conclusion that I may be whiter than she originally thought. I wasn't sure that was possible, but there you have it.
Seamus is an Irish dive bar. If that's what you're looking for, then more power to you and come on in. I'd have no qualms about coming back.