It's the best Irish bar in Phoenix metro and certainly holds its own against Casey Moore's or the Bikini Lounge. Rula Bula is large and well lit, with a large patio out back. There's as many varieties of Irish beer as one can drink.
The real key to Rula Bula is the nooks. Something that few bars have managed to do right in this town is nooks. My favorite spot is just inside the front door, off to your right as you walk in. I've spent many a night huddled with too many friends around the tiny table there.
There's a large stage that generally features good Celtic bands of one stripe or another. Pints average five bucks a piece which is respectable enough for Mill Ave.
Rula Bula, without a doubt is the bar that reminds me most of my time in Galway with a happy, open atmosphere, plenty of room for chatting up strangers and nooks aplenty.