Dreamcast............ SHENMUE.

Both the console and the game deserved FAR better.

Lost Odyssey - IMO the best JRPG this gen, made by the creator of Final Fantasy, and a much much better game then the Final Fantasy's of the decade.

Front Mission DS - Only localized version of the original Front Mission. Sold 10,000 units in North America.

Skyward Sword - One of the best Zelda's in recent years, and it's sales come nowhere close to Twilight Princess

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That's about all I can think of on the top of my head. Usually games sell better then I expect them to, e.g. God of War 3, GT5, Mario Kart Wii, New Super Mario Bros. Wii, Fable III, FFXIII, etc.

finalfantasy ix, how did this game only sell 5 and a half million? it's the greatest thing ever created! D:

should have sold more then vii

Metroid Prime 3. There seemed to be a lot of hype for that game, and the previous entries had been fantastic, but their sales limited by the small gamecube base. I expected it to be a turning point for the Metroid franchise. The sales did surprise me, but in retrospect it makes sense.