You'll love it because it's hard. Aw yeah!!!
I'm not saying that this game is the best but it has a certain appeal to it. So humor me while I rant...
Etrian Odyssey tries to mix dungeon crawling, turn-based, and rpg into one jam-packed game.
And the result, is Etrian Odyssey itself. Hah.
The game on easy difficulty(which is the only difficulty you'll get) is hard. But when I thought about it, the game is pretty easy if you're just patient enough and love level-grinding(even not that much).
There are new features found in EO3 which I could rant on and on but I would rather not(you could check out the other reviews). There's nothing unusual about it in a game. But what makes it diffirent from most games is that you'll die a lot. A lot. If you're not that careful or even lucky.
So as for me, the real fun I had while playing this game is not accomplishing quests, proceeding through the story, or beating monsters but rather seeing my characters grow. From being weak into being kick-ass.
It is very rewarding to see my characters after hours of planning and grinding defeat monsters or FOEs easily like they're the Justice League or the Avengers. That made me love this game.