I've seen this game get a lot of flak for not having a Chat, Balance (Release Khronos anyone?), or a dedicated Ranked system. But i will not review this comparing it to League or DoTA like others have; I'm going to take this game for what it is, and if you do too, then you may have as much fun as i do.
The main draw to this game, for me atleast, is that the matches are quick. Real quick. This, to me, gives it a Hearthstone-esque feel; It's a game that you can pop in, play a quick match, then go do something else.
That's not to say that it isn't fun; The idea of no Creeps/Minions may sound odd at first, but the constant combat and rush of trying to get a power up first or the Chest make for a fun experience.
People also knock the art style, but that was one of the major draws for me. I love bright, vibrant art styles, no matter how 'Cartoony' it looks. While it isn't the sharpest around, it is at least fun to look at. I've also never had a problem seeing where i am in all the ruckes, which is a huge plus for me.
The lack of chat is by far the biggest problem here, but it also has a few up sides; Toxicity is very very low within this game, in a Verbal Abuse manner that is. This is something that all other MoBA's struggle with. Now true, you cannot plan tactics, but if you're really trying to win every game instead of having fun, i would highly suggest you get two friends and hook up on a voice chat system anyway.
The Hero progression is also an interesting mechanic. Playing matches gives you EXP for the Hero you chose that match. Once they get enough EXP, that Hero levels up. Leveling up gives you a skill point to put into one of your Heros three abilities, such as Lifesteal or Damage Reduction for the skill you are improving. Because of the Hero Specific Queue system, you can pick your favorite and go to town, never having to worry about someone else getting the Hero you wanted.
All in all, i have a lot of fun with this game. Yes, the balance is terrible. Sure, it's not as strategic as other MoBA's. But shouldn't even think about getting this game if that's what you expected.
If you want a quick, fun game where you can pop in for a quick match and pop right back out, then i highly suggest Solstice Arena. It will not replace League, DoTA, or whatever it is you play, but it is nice to kick back for some good ol' fashion brawling every once in a while.