i don't think wakka's weapon was the worst,i think it's pretty fun, though. the most annoying weapon is lulu and tidus's weapon, i just can't stand it to dodge 200 thunderbolt and i have never won the chocobo race with the time 00:00 oh, i didn't i mention that i can't even get kimari's weapon, either, don't know to activate those stupid cactuar stone....
by the way, the easier way to wakka's weapon is to fire the whole auroch team and fire the free agents...my team usually has tidus, wakka , brother (rikku's brother), swanda the chocobo trainer, look for her at the calm land, durren look for him at the place where you found the rusty sword and jassu.... well, i never have to use jassu that much, though... cos with tidus and brother at the front, my team is invincible!!!