While it ain't what it was back when the concept of an Apple Store was new and novel, I can't knock the Chandler location too hard. Apple's done a lot of improvements across retail, and this store specifically has seen major improvements in staffing and speed. Also music volume.
I still wouldn't want to be here on a Saturday or Sunday (Don't do it! Step away from the mall!) except with a pickup confirmation in hand, but every recent trip has been relatively painless. In-store pickup is amazing, especially if you've got an iPhone and the Apple Store app. (Seriously, if you have an iPhone and aren't using the Apple Store app for purchases you don't need help with, you're crazy. It doesn't get easier than "Amanda has your iWhatever" and Amanda standing at the entrance because the app told her you were just about there.)
Outside of peak hours, any number of helpful and friendly employees are right there to help out, and there are enough systems that you can play with whatever you want in short order if not immediately. Their level of product knowledge is all over the place but if you have specific concerns they will try to find someone who can knowledgeably answer them.
Getting a Genius Bar appointment is still a blood sport, but there have been major improvements in the in-store experience once you actually have that appointment. Heck, the last couple times I've had an appointment, they've actually helped me early. That's a miraculous turnaround from standing around grinding against your MacBook for an hour past your supposed appointment time. I'll take it!