I still like FFVI, but I have to agree about the character roster skills. Relm is useless unless she's copying Gogo, Umaro filled up space, Terra, Locke, Sabin, Edgar and Celes were absolute tanks when everyone else fell short, the game was on whole too easy as well. I loved the opera part, but I hate the cinematic that precedes a pretty tight timed-part. I think, more than any other title in the series, this deserves a remake worthy on next-gen though.
I agree that some of the characters were pretty useless but other character skills were quite powerful. Cyan's lvl 7 swdtech was the most powerful attack in the game (at least against a single target). And Umaro was a friggin tank statwise. Who cares if you can't control him? Just make sure somebody
in your party can heal and you're good to go. One of my favorite things to do was pair Umaro and Cyan because Umaro continues to attack while Cyan's swdtech charges. And speaking of Cyan again, make him learn quick and you get to charge his swdtech at your leisure (and do it twice, no less). The only other attack that is comparable is quintuple-ultima with the gem box and quick (and hopefully an economizer or else you will run out of MP doing that real
I felt the best characters were Terra, Locke, Celes, Sabin, Cyan, Shadow, Umaro, and Gau (yes, Gau, at least if you spend the time to learn some good Rages). Gogo is totally over-rated. Sure he (she/it?) can use any skills, but his stats suck so he'll always be inferior to the original. Edgar was good early on but felt completely useless in the late game. Mog felt like Gau but weaker and with fewer attack options. Strago had potential but never lives up to it. Relm and Setzer just sucked. Still, it's a big cast and half of them are in my 'good' categories. And there is far more interesting diversity to them than in later FF games where characters are only distinguished by their stats and their limit break attack.
And yes, I have played way too much FFVI. But I still love it. A current-gen (side-rant: These systems have all been out for several years now, why are we still calling them 'next-gen'?) remake of FFVI would make me so happy I would explode.