It feels very Final Fantasy to me, however each Final Fantasy is very different in setting. Since they are drawing most of their influence from Final Fantasy VI and VII, I'd say the "electric guitar" fits perfectly.
Final Fantasy VI - Battle Theme (The Black Mages)
Final Fantasy VII - Boss Battle Theme (The Black Mages)
Both Final Fantasy VI and VII are set in more science fiction type settings, while Final Fantasy XIV is almost in a
technology driven renaissance setting. I think the music fits the game very well, sounds very Final Fantasy, and its used appropriately. In Final Fantasy X the final fight had one of the heaviest songs I'd ever heard in a Final Fantasy game.
Final Fantasy X - Final Boss Battle Theme
Final Fantasy XI had a medieval style setting, and the soundtrack matched very well by giving it a grand adventure type feeling. It was the perfect match for their first fantasy MMORPG, and it worked great for Final Fantasy XI. I don't think that same music would fit the universe of Final Fantasy XIV, and even the current XIV soundtrack had to be modified because it wouldn't have fit the changes in A Realm Reborn. It all sounds great to me and helps drive emotion during combat and story sequences.