Still a better character than Fett.
I disagree; Fett--in TESB--played his intended role as a single-purpose antagonist (similar to Greedo in Star Wars) and it obviously worked. That was upended by dragging him into ROTJ at all, and IMO, it would not have mattered if he played a bigger role in the film, or died by deliberate action rather than accident. He did not need to be in ROTJ, but at least he actually served a purpose when he was introduced in TESB. The same cannot be said of Phasma, who was built up to be...what the Hell ever, and not once did she mean anything to the films. Any other faceless First Order character could have played her role and no one would have blinked an eye. She was supposed to have this tension or history with the stumbling stereotype that was Finn, and of course, that never developed in any believable manner. She was just someone dressed in chrome, designed to sell action figures off of the pegs, and even that did not work out too well.