God, all these years later and I still just don't fucking get Blitzball. It's so unnecessarily obtuse and frustrating, and the horrible stats of the default Aurochs players makes it seemingly pointless to even try and beat the Goers. (I know it's certainly possible, but I can't do it even while exploiting the "waiting-behind-your-goalie" glitch).
I didn't bother ever trying to get Wakka's stuff through Blitzball back on the PS2, and I doubt I will here either. Nothing is worth having to put up with Blitzball for even a second, let alone hours.
I wouldn't say giving up on the most powerful attack in the game, is not worth it. Even considering it can be obtained with as little as 2 or 3 games (just win a tournament)
If you have any intentions of fighting any of the optional bosses in the game, you are basically crippling yourself if you give up on Wakka's Attack Reels, and thus would need to resort to using Zanmato for everything else, which means even more hours wasted on Gil farming just to make that strategy even worthwhile to use.
Yes, the Aurochs suck, beating the Goers however does not warrant the reward you get, which is just a bonus cutscene and a power sphere which can be infinitely farmed for later in the game.
However completely replacing all of your team members minus Tidus with certain players makes Blitzball pathetically easy and trivial.
Trying to score with a low level team is worthless and won't achieve much. The first thing to do in Blitzball is to ALWAYS set the controls to manual. Never use Auto for any reason. After you get your hands on the ball simply pass it around to your team mates. Actions = Exp, so the more times you pass the ball the more exp you gain (Especially Tidus to gain his Jecht Shot), simply pass the ball in the first half and don't ever let the opposing team have a chance to handle the ball and level up themselves. This is the key to leveling and eventually overpowering the playing field.
Tidus's Jecht Shot completely ignores any two defending players. So you could have Two Defenders on top of Tidus next to the Goal Keeper. Simply using the Jecht Shot without breaking will nullify the defense and more likely blow through the Goalie as well. Yes abuse that move. It's THAT broken.