Tatanga was an awesome character, and yeah he was only in two games...so that REALLY surprises me they haven't brought him back, unlike the characters who have only been in one game...or NO games for that matter. (Cough: baby peach, toadette, waluigi, etc.)
Seriously though, when I saw that they had put baby peach in mario kart wii, I died a little inside...and then I said "Is that the best they could come up with? Are they even trying anymore?"