They're still one of the strongest (single target) DPS jobs, though Dragoons could well be giving us a run for our money now. Absolutely viable in raids, or at least the old ones as we don't know what's coming yet. But it was probably the most desirable melee job in the past for progression due to heal boosts, reducing enemy magic damage near permanently, and just generally being the best single target demolisher when played correctly.

I don't know what level you are yet, but it should be noted that their rotation between 50-60 barely changes, so if you're already 50 you've pretty much got the full gist of things. Apart from one cool looking off-gcd to weave everything we got in the expansion is rather situational, though the ability to change stances when not attacking is pretty great when you get a feel for it.

Anyway, people have different opinions of fun gameplay, some hate monk, and many love it too. As I'm sure you're aware, their play style revolves around almost constantly taking advantage of hitting certain enemy positions, so you'll be moving around very frequently. They also have to maintain Greased Lightning, a stacking buff which increases your damage and speed. All in all they're a very fast-paced melee that's always on the move. For some its a chore, others a joy. It's very intimidating until you get the rotations / priorities as second nature, then you realise their core rotations aren't too complex. Then the main focus becomes your buff timers. Greased Lightning is a huge priority, and you'll be changing stances during downtime and maybe even taking hits if you can get away with it just to preserve it. You also have 2 dots and 2 other important buffs to think about, and if all that's running fine and dandy - or you can't do anything about them at present - then you've got chakra stacks you can charge up to use later on a powerful burst move, or extra TP if you're suffering.

If all that is your idea of fun, then yes they are totally viable.