Final Fantasy X has it's pros and cons. It's not as good as Final Fantasy IX imo and was a bit of a step backwards; but it does have it's highlights.

Pros > Good battle system, controllable summons, awesome music in parts, storyline goes to light to pretty much deep-thought provoking- and emotional. Auron, Lulu and Rikku.

Cons > Too linear, dreadful voice acting, dreadful villian compared to Kefka, Sephiroth and Kuja.

However I don't think that Final Fantasy VII is the most overated Final Fantasy, I think that title belongs to Final Fantasy X because it's usually crowned as a prefection golden crown of a RPG when it has flaws glore. I don't hate FF X though.