I have to disagree with you greatly for the "Tidus is the worst main character in Final Fantasy history."
Tidus is one of the first characters that more accurately represents what a person would do in his situation.
Tidus is a popular teenager in a world of luxury(Like people from north america) who has spent his life never having to put his life on the line.
Suddenly he is dropped in a world where not dying is a fucking luxury. Where everyday is a fight to survive for most of the people of spira. Where monsters run rampant and a giant aeon of death and destruction mindlessly attacks spira.
To top it off, that monster is his dad, your surrounded by people who don't actually like you, but rather who you remind them off (Wakkas brother, Jecht) and until half way through the game don't really care for you at all.
Oh yeah, your also not real.
Tidus, unlike so many other of Squares characters thus far, reacts like a real person. Scared, confused, angry. He doesn't instantly pound his chest and run off to save the world in a blood fueled rage.
He acts like a living person with a past. With an identity. He has a consistent and believable personality.
Hell, if i was in his shoes i probably would have gotten shot five minutes on the boat if not drowned or killed. Christ actually i probably would have been killed on that bridge.
Tidus for me is one of the best characters for me simply because he isn't another slap your chest and run towards your enemy screaming for blood, tobacco chewing, Jerky eating lumberjack.
Tidus for me is a very interesting character, and i wouldn't want him to change in anyway.
Though yeah, the actual way they were drawn was stupid beyond repair. However go back and look up the character art for the older characters, silly costumes are kinda a staple of FF.
I liked blitzbll though, It was a fun little diversion from the main game. The linearity was a different way of doing there game. They tried something different and new in respect to the series. Also i forgive the voice acting simply because that was the first game i ever played fully voice acted. It was really well done to me. People always complain about the laugh scene but that's the point. Its SUPPOSED to make you cringe.
It has flaws, the storyline makes sense to me but you have to pay attention ALL the way to the end otherwise it doesn;t make a lot of sense, but I like that. I really wish that Seymor would put a fucking shirt on, and half of them are dressed like clowns anyways.
However the downfall of the series? No. It's just a different idea. I wouldn't accuse ANY of them to be the downfall of the series. With the exception of 8 and 12 i have enjoyed each of them.
I really wish they would get over this obsession with FFVII they seem to have. My main problem with that is how i refuse to mention i am a fan of FF in public anymore because every time someone says the words "OMG have you Played SEVEN! Isn't it the best ever!!!!!" and i have to try and explain "it was okay, but six, five, four, ten and nine are about six thousand times more fun and i don't want to hear you talk about it for three hours"
Then they make this horrible whining noise that makes me glasses crack. This isn't FFVII's fault by the way, but god it's fans annoy me.