I don't do much content, but when I did Ifrit the #1 thing that killed the fight (and mechanics) for me, was animation lock. They absolutely, 100%, NEED to fix animation lock before they can make battles more interesting. If you watch boss battles from other MMOs you may deem more "fun", you'll notice there is a lot of movement going on and people are constantly having to dodge barrages of ranged attacks, some of which may punish proximity. In FFXIV, these mechanics are impossible due to animation lock.

Either way, I do think the game is "fun" as a game, but I would have to agree that content in this game needs serious help. And animation lock, in my opinion, is easily the top issue, even above latency or boss/class/job design.