I can only comment on the couple of Gold's Gyms I've been to.
The customer service people and trainers are friendly and helpful, and usually they stay out of your business while you're training. The only unsolicited advice I received was a recommendation to do leg extensions instead of the box pistol squats I was doing.
Quality and quantity of equipment varies greatly from gym to gym, mainly because some Gold's are franchises and some are corporate. Corporate Gold's tend to have the nicer stuff. One Gold's I went to has a cardio room that's also a full size theater where people watch movies while they leisurely bike, walk and elipt(?).
You get a mixed bag in regard to the members. There's lots of soccer moms and cardio bunnies, a bunch of lightbulbs benching 3x week, and a few huge and serious lifters sprinkled in.
As long as you put your blinders on and do what you came to do, they're good enough for training.