Yucca Tap Room is the perfect live music/divey hipster bar that the main bar strips like Mill and Old Town are always missing. The crowd reminds me of a mix of typical musicians and artists, as well as people who were probably teenagers attending the Warped Tour a decade or so ago. My favorite part of this bar is the live music, and that's exactly why we go.
I can guarantee that on a Friday or Saturday night, there will be some bands playing and people rocking out here. The bartenders are really quick and they usually have some great craft beers rotating on draft. The Tap Room also has plenty of liquor options and they're prepared to cook bar food late into the night. The people I run into here are always pretty nice, and this is a bar I could see myself frequenting. The prices are also super reasonable for Tempe, especially at happy hour.
I would recommend Yucca Tap Room to anyone who likes live music and doesn't mind a divey/grunge feel. Personally, I prefer it at times.