This is the most played minigame by me and I think it's the greatest thing in FFX (beside of Monster Arena, of course). :3
On the other hand, Blitzball in FFX-2 is a big mistake... this is one of the reasons why I won't play this game - NEVER! E-E-EVER!!!
FFX Blitzball - BEST MINIGAME EVER - loved it and spent many an hour playing just to play Blitzball!!
FFX-2 Blitzball - not played in ages but I remember they tweaked it somehow and it was more like Blitzball Manager