Straps
Early in its life, the Wii Remote's wrist straps were known to break and cause the Remote to slip from a user's hand in mid-swing. This caused a variety of injuries, broken windows, shattered television sets, and dented walls until Nintendo began circulating improved straps in August 2007.
Jacket
Complicating the problems presented by its breaking straps, the Wii Remote's hard exterior not only led to player injuries and broken devices, but shattered Wii Remotes, as well. Nintendo released a silicone sleeve, the Wii Remote Jacket, in October 2007 to protect the Wii Remote and its users in case it was accidentally dropped or thrown.
Sensor Bar
Occasionally, the Wii Remote's sensor bar will have detection problems if other infrared sources are around the bar to cause interference.
Motion Sensing
The Wii Remote does not have 1:1 detection on its motion sensing without the use of the Wii MotionPlus, which is sold separately.
Batteries
Nintendo has inexplicably refused to manufacture a first-party, rechargeable battery pack for the Wii Remote, forcing users to spend money on expensive AA batteries in order to play.
In-game Motion Detection
Some games, such as Cooking Mama: Cook Off and Trauma Center: Second Opinion, have difficulty detecting some of the Wii Remote's motions, which complicates game play.