Wii:
1. The PAL Wii has the 50 Hz version of most of the VC games, and I simply cannot understand why Nintendo did this. One thing was that we had NES games that run 20% too slow with big black borders and thus a slightly wrong aspect ratio 20 years ago, but that we still have to live this today???
For this reason, I sold my European Wii that I bought at launch and imported one from Canada. Now I get all the games in proper 60 Hz, + the games are cheaper :)
2. Lack of storage space. Mine is completely full with VC and WiiWare games.
3. Internet service is too slow, takes too long to connect to Wii Shop etc, and takes too long to find opponents in games like SSB:B.
4. FRIEND CODES - BLAH!
DS:
Internet service is too slow, apart from that, it's mostly good, would have liked some internal storage space and a built-in, WORKING web-browser (Opera on DS is terribly slow and unusuable), but I guess the processing power simply isnt enough.
Edit:
Oh and another thing with the Wii. For the NES games you cannot map the buttons on the controller yourself. Playing a NES platformer like Super Mario Bros with the classic controller is almost impossible, because you have to use the classic controller's B button for running and A for jumping, where it should have been Y for running and B for jumping with the SNES-like layout.
This means that the only way to play those NES games somewhat easily is to use just the Wii remote, which is not very comfortable to hold sideways (and the classic controller has a better D-pad). The GC controller is not an option either as the GCs d-pad is completely useless.
Huge oversight by Nintendo, I wonder how they can make simple mistakes like these...
2nd edit: When your Wii is set to 16:9 mode, the Virtual console games who are all 4:3 should have been automatically letterboxed with black borders on the sides so you got the correct aspect. Annoying to have to switch that on my TV manually.
