Sonic and the Secret Rings. They have been some other more minor disappointments, but that was the one that really stood out.
Apart from that, I have about 20 DS titles and 10 Wii titles - and don't regret any of them. Harry Potter (Wii) was a bit of a regret, but I traded it in for $40 (part of SPM) so that wasn't too bad.
To date, the Wii is easily my most "least-regretted" console. I can't believe how much time I spend on it - and I would spend a heap more, if I had more free time :P
Gesta Non Verba
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