Walmart Supercenter in Riverside offers a generally positive shopping experience with friendly and helpful staff, including helpful door greeters and a courteous cashier. The store is praised for its cleanliness and convenience, with open or short wait times at checkout. The pharmacy staff are especially appreciated for their great service. Customers feel the store is well-stocked, although some mention difficulties finding specific parts or trusting staff to watch their carts while shopping. There is a sense of courtesy among customers and employees, creating a pleasant environment. However, there are occasional issues such as missing items due to manufacturer errors and carts disappearing when left unattended. Overall, shoppers enjoy the store's friendly atmosphere, helpful service, and ease of shopping, making it a favored location for their needs.