Hmm.... the worst game iv ever played...hmm, toughy.
for the PS2:
I think im going to go with either "Scooby Doo: Night of 100 frights" or "Disneys Donald Duck's quack attack"
They both came with the PS2, and there still on my shelf to this date because THEY WONT SELL!!
I do complete 99% of my games though to review them fully, and these 2, i did complete.
for the GC:
without a doubt it is "Universal Studios: Theme Park Adventure" which came with the GC, another that is still sat on my shelf because it wont sell.
Now, i cant give this a full review, because i got SOO bored after the first 30 minutes, it is one of the few games on my shelf that i havent completed and dont plan to, it was the worst gaming experiance of my life, 30 minutes wasted