While my Wii didn't get used as much as my 360, I still got plenty of enjoyment out of it.
The motion controls were probably the biggest problem, not because that they were there, but because most developers had no idea how to use them. As a result, there were so many games were the motion controls were just tacked on and/or were a hindrance, making them much harder to enjoy.
The other thing I hated were all the stupid, useless peripherals. So many pointless plastic golf clubs, tennis rackets, baseball bats, bowling balls, etc., etc. for the remotes to snap into to make the game play worse. I worked in the Electronics department during that time and at one point we had 6 feet of shelves dedicated to that crap.