After reading this topic and thinking about it for a bit, the least fun to play port I can think of is the Game Boy Advance version of SSX Tricky. The graphics were impressive, and looking at reviews from when it came out, it wasn't too badly regarded. I just always thought that it was dull and plagued with missing features to the point that it inspired me with vitriolic hatred, which is never a good sign. I was weirdly passionate about my love for the PS2 version of the game, though. If I were to go back and try the game again, I'm sure I'd be less inclined to condemn it, but it was such a flashy game that I'm not sure a GBA port was ever a proper fit for it.