I'd say I agree to a point. I think Cloud is what makes the storyline what it is, but at the same time. I'd agree that his character could've been fleshed out a bit more in a lot of ways. Especially in his relationships with Aerith, Sephiroth and Zack.
Like for example. I genuinely like Wakka from Final Fantasy X and think he's a great character with a lot of development. He has a genuine albeit misguided reason to hate the people he does given his situation, his firm beliefs in Yevon and to not spoil an over a decade old game his brother's death.
Plus he has a great character development point throughout the game that lessens his hate towards the Al bhed and even sees him developing a genuine friendship with Rikku and the other Al Bhed to some degree
30 here, wassup