eolsunder: Personally i think its either a rpg or a adventure game like you said depending on how you build your main character. If you build it as a support character, you can fully enjoy much of the game has to offer, crafting, a big party of adventurers ,etc. You won't yourself become a big powerhouse hack and slash god.
If you build your character as a full warrior, or mage, etc where you can clear out dungeons solo, won't have much party members, etc then its more an adventure hack and slash do it all yourself game. You can't have both. Personally if you do it all yourself you max level half way through the game and the game is boring. Isn't the way to go, but it's the easy way.
Going full technical support/charisma character is much more fun, stretches the game out, and lets you enjoy many things you won't normally encounter. Going a mage support character is good also but even as a mage your magic makes you way to powerful even as a support character, but you really should pick 1 of those 2 options to fully have fun in the game and not make it super easy where you can yawn and clear out entire dungeons solo without blinking.
full tech support leader character, or if not that, a mage support leader character. Leave the full offensive warrior or mage builds behind, they are way to easy, way to fast leveling, way to boring.
Wow I have never been thinking about this game this way! :O So it is a true RPG then as you can play many many different "roles" and not just a magician or a technician.
For my first playthrought I chose to be a 100% technician as crafting via schematics impressed me! I love the game absolutely so far :) It just made me wonder if the RPG elements here were too open ended for its own good. :)