Good observations guys..
I like how you pointed out about the characters. Even though Terra's character might be the one that ultimately drives the plot, to me there is true main character in FF VI. Each one has a different personality and brings something different to the table. It kinda shows how all these different people from different backgrounds and stories can be brought together for a common goal.
Haha you didnt like Gau though? I thought he was a great character..i especially liked the scene where you find his dad and you get him all dressed up and looking nice before Gau meets him. Plus his theme song is one of my favs from the game.
In battle i definitely didn't use him much though.
I guess it can be criticized for being a little easy over some other titles..but there are definitely ones which are easier. I think both X and X-2 are the easier, maybe even IX. You're right tho, some bosses in VI can be hard.