Can you please provide some sort of challenge while questing? Leveling is horrible!

[Fire-Dragon-DoL]

What you're saying is counter-intuitive. You say you want more challenge to "make it fun" because leveling is slow. And you're ok with leveling being slow if it's fun. But making the monsters harder to kill isn't going to make it fun, it's going to make it more tedious. The only thing they could do to make it more "fun" would be to have different mechanics other than "fetch this, kill these". Because the "fetch this, kill these" mechanics are what you are saying are boring. Making them take longer to kill isn't going to magically make that more fun.

If you want to have more fun, then skip the side quests. Just do the MSQ and fill in the rest of your XP with Hunts, Dungeons, Challenge log, etc.

More challenging doesn't mean "Increase the HP BAR", I've said I can accept it being slower if they are more challenging. Challenge is what makes a game interesting usually, but you can be challenged with anything: a puzzle, a platform section, a mob fight, whatever. I don't have any details on how to make them more challenging, it's not my job, but I played various games when you can die from trashes, not only from bosses.
Damn, even the first super Mario had more challenging trash mobs, LOL!

That being said, I accept your suggestions on the other stuff, although you must explain me a bit more because I'm a noob from level 51 to 60, so I don't know exactly:

1) I can do dungeons, but usually after 6th time it gets boring (can be more if dungeon is well done, but so far I faced only 2 dungeons and I'm in the process of facing the third one, after dinner)
2) Hunts: I thought these were only a level 60 thing. How can I get those? What can I do? I thought the Hunting Log wasn't used from level 50 to 60, I was very disappointed not having that available, was a good source of Xp, is there anything similar?
3) Challenge log, I have no idea what is that, can you describe?

If you hate that, you're going to hate the Moogles muchly.

To be honest I like the quests that have their own little storyline (the Chocobo Hunters with the Newbie Miqo'te Chocobo hunter keeps going up to level 58)

(presented out of context to avoid spoilers)

... but I hate the back-and-forth to the same spots over and over. It's less annoying once you get the Chocobo to fly. But keep in mind that that specific zone has no less than three sets of quest givers, so you'll spend a lot of time there and in the next area just doing all the side quests for experience.

As for how SE could improve stuff to be more challenging...

More of those "instanced" storyline type of combat would be fine in the optional quests. As far as I can tell, I don't think there are any in the optional quests, they only exist in the job quests and the MSQ. I know some people hate storyline, but I find the combat storyline bits to be fun, albeit they can only be done once.

If the moogles parth is the one level 53-55, I've finished it today. Not sure how I survived that, though, but I'm sure I hate moogles now.

I wish to say go play another games OP. Really tired with so many complaints.
I think only me who found that this Game is good mmo with casual and solo content.

This mmo is suitable for busy player who still want to play mmo, there are many games out there for people who have no life that you can choose.

This is not a casual mmorpg, unless you skip ENTIRELY the leveling and you play minigames only.
Leveling is long and once you get to maximum level, dungeons become difficult.
Sure you can play it casually, but not only you'll get nothing (there are many more fun games that you can play and get more from as a casual gamer, not to mention cheaper) good out of it. Yeah you can play it casually if you are a Final Fantasy fan, but if you are not, this game doesn't fit at all.

Believe me, I played ARR with my girlfriend, I'm a gamer since ages, she "started" only recently (well, 5 years now), and once we reached level cap, the big skill difference came into play, she struggled with basic dungeons while I was breezing through them and moving toward Coil (which was very challenging for me too), so I don't see how this can be handled casually. And she even trained a lot, she managed to defeat Titan hard, but what required me few days, required her a week of training. So no, it's not for casual players.