This game isn't quite up to par with the original Banjo Kazooie and even less so, with the good platformer games for GBA like Super Mario and Wario Land 4. That's not to count this game out though, it's still good fun.
Gameplay - The downfall of this game is probably the gameplay. The missions are exactly clear on what to do and it sometimes gets frustrating because the controls are kind of choppy and you might have to do some things over again before you can get it perfectly. Also the game seems to be basically the exact same Banjo Kazooie on a GBA with weaker controls and gameplay. Then again they actually finished this game in 2001 and just didn't publish it until 2003.
Graphics/Sound - Graphics and sound are definitely the key point that holds this operation together. The graphics are great for a 2001 GBA game, the characters are easy to see and the camera angles don't get as confusing as most GBA games. Then again the average camera angles for GBA games suck. The sound is good the background music is catchy and cool and the characters still make that neat muttering sound they had in the first games.
Replay Value - I can't recommend this game because the replay value is definitely needed in a platform game and unfortunately this game isn't good enough to want to play again. If you want a good Banjo game get Banjo Kazooie and not this one.