why does everyone like 10 so much?
Because it's a good game?
it has no world map to openly explore and travel,
Yeah it did...
its has nearly zero end-game extras to work on.
There's at least 50 hours of side stuff to do.
and its like a chick flick with some of the first horribly designed girly-guy characters as the series goes down hill.
Liking the characters/theme/tone is entirely a matter of opinion, not something to grade a game's quality on.
it changed everything that was great about the entire series for a new generation of simpletons that want easy gaming.
I'm guessing this opinion is based on ignorance. There's a sphere grid, combat system, weapon and armor customization, blitzball, aeons, monster arena, and legendary weapons. All of which are deeply developed and complex, and can also prove to be challenging if you don't put some thought into it. Final Fantasy X is by no means easy. The same goes for XII.