Wow what a hateful kid. What is he, 13 or something? Get off the Internet BP, no one even cares about your tastes or opinions. Maybe if you played Donkey Kong 64 you'd find it's basically another Banjo game. You'd like it.
I don't have Mario Kart Wii anymore, because my friends and I preferred Double Dash!! for multiplayer and the single-player was... frustrating. But when I did, I had unlocked every character except Baby Daisy (by coincidence, I didn't meet the requirements for her, and when I found out what they were and that she was in, didn't bother with it) and the second Mii outfit.