Yo, don't even waste your time reading this recommendation, just go play it. You've got nothing to lose since it's free to play. Go.
Wait... you're still here? Still not too sure about it, huh? So, you want to hear more? Fair enough. Well, this is a game that finally does "Free to Play" the right way. Yessir. No more pay 2 win ♥♥♥♥♥♥♥♥. There is PvP in the game, although it is optional. The game is more about PvE and dungeons in my opinion. Also, there's no locked content or anything that would prevent you from enjoying the game unless you'd pay. Instead, there's an item store where you can buy super cool costumes for your character with real money. They DON'T affect the gameplay since they're just costumes. Cosmetics, y'know the deal. But you're gonna want them. Oh yes. Because the game is a hell of a lot of fun and you care about the way your character looks in a fun game that isn't a FPS. I mean, look at TF2 for instance. If you have hats in TF2, then you're definitely gonna want to have some cosmetics in this game, because here you can actually see your character at all times. Now, you might be asking yourself, "yeah but what if I don't want to pay, will I still look decent?" Well my dear reader, you'll be glad to hear that yes, you will be able to have your own style and look decent even if you do not pay. Your style will be less fancy or less over-the-top, but there's a lot of different clothes that you can drop, and the cool thing about this game is that you can enchant and give attributes to your items. This means that your old dusty shirt you love and cherish can actually be great for a lot longer than you would imagine. I won't go into details but you get a lot of in-game money by simply playing the game, so you can actually enhance your equipment very easily and it's fun to experiment with that.
What else is there to say? I guess I haven't talked much about the actual gameplay. Well, this game uses a basic melee combo system and a spell system that uses mana. Your mana regenerates faster as you do melee combos. So what you do is you combine your melee combos with your spells and it's super fun and satisfying. Also, there are 6 classes to choose from, which actually adds A LOT of replay value. So if you decide you're done with a character, you can make a new one and it's a whole new experience! And then there's the surprisingly great music that adds a lot to the intense, fast-paced combat.
All in all, this is quite frankly one of the best free to play games I've played in a long time. Longest recommendation, yay.