GameStop president Tony Bartel says the retailer has seen "slower than expected" sales of the Wii U so far this year in an interview with Forbes.
"Nintendo plans on launching some of their biggest IP over the next few months which we think will increase gamer interest," the executive commented.
"Software will play a big part in each console's success over the holiday," he added, "we're already seeing great developer and customer support for PS4, so Wii U will need great title's, especially first part titles, to compete.
"There's also a need to increase consumer awareness of the new features available on the Wii U and its tethered tablet features," Barlet concluded.
Nintendo have already lowered their sales projections for the Wii U from 5.5 million by the end of this month to 4 million while analyst Michael Patcher has commented that the company "misfired" with the Wii U.