I've had a great time every time I've visited this club. The overall experience has always been good for me. Let me break down it as easy as I can.
Staff: From Security, the bartenders, waitresses and hosts. Everyone has been professional and has given me first class treatment. It seems like if you're nice to the staff and personnel there, they were more than happy to go above and beyond in customer service. Regardless, everyone I've encountered has been great. The staffing levels were effective in ensuring a great experience for everyone.
Headliners: I've seen Calvin Harris, Hardwell and Tiesto there a couple of times. The Big Name Resident DJs won't come on until later. 1:30 AM would be considered early for them coming on. The Sets and the experiences have been fantastic. Sound and lighting seem to work well with whomever is showcased.
Venue Setup: The main room where the DJs are showcased can get crowded quickly but it's just big enough to hold enough people for an intimate concert that would be hard to find anywhere else. There are many levels with lots of stairs. Ladies please be careful with your heels. The Ling Ling room is a nice little get away when you actually have to have a conversation with someone.
Price: I'm fortunate enough to not have to worry about the entry but most people I know pay $50 at the door. I've heard entry as high $100 on some nights. Beers are about $12, Shots & drinks at $15. This is not the night club to go on a budget on. Treat this like a bachelor/bachelorette party mindset in Vegas: It's going to cost some $$$ but it's better to throw down the money for a good time versus not to. If you want to frequent Hakkasan without having to spend some money, just like any other place in Vegas or life in general, it's all about networking.
Summary: It's the most popular nightclub in Vegas with the best mega resident DJs with high end appeal. To expect it to be anything else would set you up for a disappointing evening. I'm not there every weekend but I'm there to see my favorite DJs and I have yet to be disappointed with the experience.