Mulligan's has been a regular spot for my friends and I to hit up in Scottsdale for years. It's right in the middle of all the Scottsdale bars but you don't feel like you have to be all dressed up to be in there, the prices are good, and they don't charge a cover. The place is pretty small, so it can get annoyingly crowded on some nights. But Mulligan's isn't as popular as it used to be, so that's becoming a rare occasion.
The only major negative is how loud they play their music. While I expect bars and clubs to play music at a high volume, it's super deafening in there. It can be very hard to hear people when you're talking to them in there.