Actually (potentially) helpful response:
The world is not continuous like a Zelda game or anything like that so forget about that kind of exploration. It's set up similar to Phantasy Star Online since you haven't played MH. You have the city area which is your hub, then you pick quests to do and instantly transfer to the related area upon your exit from the village.
There are basically different large quest areas with different themes so a quest may be in the desert, the jungle, the swamp, mountains, etc. Different paths and spaces may be open for different quests in the same area. They're pretty large themselves, but you learn them like the back of your hand pretty fast.
The main big quests are to hunt specific monsters which supposedly cause troubles to the village. But to do that you most often need/want to do other types of quests first to prepare for the hunt. Gathering quests to explore and learn the areas and find items you need to combine them and craft potions, traps, different ammo types for ranged weapons and other useful things, slaying quests that have you killing smaller prey that perhaps has items you need. The large monsters themselves provide items most often needed to craft new weapons and armor as that's the only way to better your character, you don't level up.
You can also buy many of the basic items if you can't bother going herb gathering for potion making for example, but generally you use a lot of what you find yourself. You also have a farm that you can tend to and gather some item types from without having to do a gathering quest, it progressively gets better as you upgrade it using points you earn from the questing for more or better item types, but you can only harvest it all once after every quest you do.
The item progression is insanely deep, MMO style, as you'll need different and dangerous to get materials for the smith to craft better armor and weapons, and the fighting is very technical and tough as you need to learn the monsters' attacks and movement patterns really well, as well as your own skillset (which differs per weapon type) to properly avoid taking damage. It's really cool and unique gameplay I haven't experienced in other franchises in anything but superficial similarities.
At first it's simple enough then quests start getting tougher and more complex like taking out more than a single large monster in an area, or needing to get items that break if you drop them so trying hard to evade enemies in the area, or having monsters beyond your league wandering during a slaying or gathering quest, etc.
For the actual hunts, you find yourself preparing really well beforehand, taking the right items with you, buffing your character with the right food, using the proper crafted equipment and gem attachments which enable different statistics, resistances, and skills, etc, as most of that can't be changed mid-quest.
There's also the guild after you're done with the village chief which has other hunting quests, and the training where you can fight against certain monsters with pre-defined items and equipment and get other rewards from.
It's certainly more varied and involving than the simple "hunt monsters" theme implies at first glance.
All these apply to Monster Hunter Freedom Unite on PSP but I'm sure MH3 is set up similarly. Also, I'm not too far in it so for example I'm not exactly sure of what more the guild offers beyond the village quests but I'm sure it's something big as I'm maybe halfway through the village chief quests (seems after I'm done more will open up though, from her feline sidekick) and I'm nowhere near hundreds of hours clocked like other players so, yeah, I guess the bulk of the game is after those
Edit: and I just realised I didn't even go into how the controls are, with "realistic" weapon handling and maneuvering of your character to avoid the attacks and how you'll need to sheath and unsheath weapons to use other items or to run faster, and how monsters at times will flee to different parts of the map so you'll wanna track them fast before they regain strength by eating or sleeping, and how each weapon type has different quirks to learn, and is better or worse against certain monsters, like the sword + shield being weak but fast and easy to aim while a great sword is slow, cumbersome, can easily hit hard armored parts of the monster you want to avoid because they deflect your attacks, yet is really powerful etc. Yeah, big game
