What ability is this, and what class uses it?

[Abriael]

If Final Fantasy gameplay took a cue from its own cutscenes, more people might actually play it.

That's much easier said than done. If gameplay could really keep up with cutscenes in most games there would be *no* cutscenes.

The only valid way I've seen used so far is turning a large part of gameplay in quicktime events, and quicktime events are utterly despised by a large part of the playerbase (and I can already see how much hate they'd generate in a MMORPG, as people would accuse the developer of taking control away from them).
There are also finishers, but Age of Conan demonstrated that they really add nothing to gameplay, and they become boring after a very short while.