Interested in finally getting into this series myself, but I have reservations.
I have a 3DSXL. Not the "New" one. Is this game even worth playing on that system? I also don't have any add-on stick thing that I've heard about, and wouldn't plan on getting one.
Also, I tried the demo version, and it was both a bit overwhelming and underwhelming.
Overwhelming: So many things in menus and what the hell is it all supposed to do.
Underwhelming: Tried lance(r?) class. Seemed like all I could do was a basic three thrust combo, and I couldn't turn while in said thrust combo. Felt like I was trying to fight in a swamp made of molasses. Was I just doing something wrong, or is combat movement not all that fluid?
Without a way of controlling camera it's iffy. You can get used to fighting by using the targeting system (just hit L to move the camera to face the monster you have targeted), but... it's iffy.
You can ignore most of the menus. There are a few that are important, like inventory. Apart from that, don't worry too much. The game does a decent job of introducing new elements as you go, and you can always ask friendly Bay12ers for help if you have a question (or just look it up on the wiki).
Some weapons allow you to adjust your aim mid-combo. Lances do not. They're a more tactical weapon. I would recommend trying a more beginner-friendly weapon, like sword and shield.
Overall, Monster Hunter is not like your typical action game. If you come into it expecting to be able to jam buttons and execute crazy-ass combos and whip around at a moment's notice, you're going to be unpleasantly surprised. Monster hunter is about preparation, timing, caution, and learning patterns. Oftentimes, you have to play by the monster's rules if you want to win.
It's different, and it's not for everyone. Nobody can definitively tell you if you'll like it or not. But if you're willing, give it a try. It's popular for a reason.