Well, I can do that for you. :)

If you like magic: just go for it. Seriously, if you like to play mages and magic classes, this game might set a new standard for you hardly rivaled by more modern ARPGs. Oh, also no classic mana. Just stamina and charge time.
Character building is not overly complicated, but still indepth enough to feel important. There are a total of 9 vocations (classes), fitting into the broad categories of "warrior", "rogue" and "mage" - and 3 of them as a mix between them.
The monsters. Goddamn, the monsters! A thing of beauty when you fight your first ogre, manticore, dragon (can be huuuuge), and many more. As you probably read in my comment above: you can also climb them to target heads, tails, legs and other parts directly, to cut, smash or otherwise damage a monster (and maybe their abilities).
The world is beatiful. Even though you barely get a glimpse into more diverse biomes, the world is just a spectacle to look at and traverse through (except for a certain kind of quest).
You will only have "pawns" as companions - effectiveness emotionless mercenaries, but customisable by yourself (your main pawn) and other players ("rented" pawns for a few levels). Which means, you'll occasionally switch your team out, fitting it to your current needs and own development.
Truthfully, you'll either love or hate the pawn system. Many find them irritating, as they will often repeat a multitude of phrases, depending on your location or your enemies and their associated knowledge (there are ways to make them less talk active - though I really liked them, lived up the adventure)
There are some really cool gameplay systems in place for added immersion and strategical thinking. For example, you wouldn't normally want to fight right after traversing a river - you'll be soaked through! (if I remember correctly that one lets you drain more stamina for actions)
Fournival is Bae.
They're masterworks all, you can't go wrong
The expansion. So good, albeit pretty whacky.

I could go on for a long time and lost even more stuff - but I'll stop here and instead list the two main drawbacks of the game.

If you're not playing on pc you'll be locked to 720p (I think?) and 30fps.
Most modern ARPGs will not feel complete to you. Seriously, you'll be chasing the feelings this game gives you. Whether that will be the combat, the look, the monsters, classes, characters, or something else, I can't say. But it most likely will happen.