If possible the best time to go in the summer is mornings and weekdays, Sunday was not bad either. The parking situation is better at the Belk end rather than the Bass Pro end, there is a structure that I have not tried yet though that is in the center of the mall. The stores are nothing special, the same stuff you will find at any mall just about with the exception of a few "Branson" stores. The water show is almost always packed, so if you want to see it you better find a spot early and sit and wait.
Other things that make the Landing more unique from other malls are the Trolley that goes from one end to the other, and I have never see it full, a clown that is near the playground doing balloon animals, the playground that is pirate themed, and the dock at Bass Pro. This has also become the night spot in Branson. Given the lack of actual bars and night clubs in town Bar Louie and Crab Shack have become the places to hang out after hours. The atmosphere is pleasant and looks a bit like an old town city street. There is actually plenty of walking space though people crowed to the edges. This is more of a tourist attraction rather than for the locals. I personally live only 35 minutes away and didn't go for the first time until well more than a year after it opened!