You think you'll like a game but when you download it and play it, you realise you've made a terrible mistake. We'll include Virtual Console games too.

WiiWare Chronos Twins. Awkward controls and concept.

TG16 Bonk 3. Lacklustre platformer.

Red Steel. Reminded me just why shooting games bore me.

Contra Rebirth

The second I realised Konami excluded the run 'n gun formula, I demanded a refund.

I don't have such games. I usually play them for at least 4 days before giving up. The most disappointing WiiWare game was "Cocoto Platform Jumper" and the biggest disappointment on Virtual Console was "Gunhed".

I make it a policy to play games that are low on my list of played games on the Nintendo Channel. This is hard for some games because I dislike them.

Links Crossbow Training. Played it for five minutes, put it back in the box, sold it off as soon as I could.

My policy is to play games as long as I beat them or until I'm sure that I can never beat them. And I always play only one game at a time. And afterwards I write a comprehensive report in my diary. Then make a day (or two) pause. Then go on to the next game.

Just Dance 4 as a download for the Wii U. It's not that I hate the game, it's just that I found out after 10 minutes of playing, toys'r'us have a weekly sale for it. "Buy Epic Mickey 2 or Just Dance 4 for Wii or WiiU, get any Wii or WiiU game at 50% off". I could of got that and pay $30 for Ninja Gaiden.

Also it took me 2 days to download but that was due to a connection error with the external hd which cause me to restart the 15GB dl 3 times.

Blastworks: Build Trade Destroy and Flingsmash

Fast Draw Showdown for wiiware.
OH GOD WHY.
Just as you say, after five minutes I knew I had made a mistake.

that Ed Edd and Eddy game from 2005 or 6. I wasn't expecting a masterpiece but I had heard some decent things about the game and that it was a shockingly decent licensed game like those Spongebob games a year or 2 earlier. But it was just a dull game and the humor was terrible.

Superman 64.....Well technically it was a rent but still! The game was so horrendous with game breaking features that I count that as a major regrettable gaming decision.

Another game would be Prince of Persia for the wii as well as the Gamecube version of Warrior Within...music was to repetitive and annoying.

ICO.

That's right come and get me world.

Edit: sorry i thought you meant games in general.

Final Fantasy XIII...wait five minutes? I played it for five hours :3

I might have already said it but Other M. Game did not live up to Metroid standards.

Wait, Metroid has standards?

Kirby super star on ds, it just wasnt fun. Also, lost in blue for the wii

TMNT for DS. Because I beat the entire game in like five minutes.

My New Years Resolution is to stop making fun of M:O.M. But.......it's difficult with so much to work with. It's like free DLC of material for a year! xD

EDIT: And looking further up in this thread, I see that I did mention the game. I'll hush from here on out about it

Sonic the Hedgehog is the only game I bought on either WiiWare or Virtual Console that I didn't really like.
And if games in general counted, I would probably say Metroid: Other M, but it was closer to 15 Minutes before I regretted buying it, I would also list Rayman 3D and Disney Universe, but I didn't buy either of them.