Zynga made a good game? Yep.
Though it's not your typical MOBA, you will still find plenty of skill and teamwork is required to win- it is by NO MEANS easy. Now, I actually started playing this on my iPod believe it or not, before they ported it to PC, and I have to say that it's actually completely playable on a mobile device, and obviously a bit more playable on a PC, but mobile players can still be competetive without feeling like they are at a disadvantage.
What this is, essentially, is the MOBA genre, condensed. There are no minions, and tower rate of fire is based on how many heroes are alive, so basically if you wipe the enemy team the towers can't shoot. There is also a gold chest objective in the center. How a match typically goes, is a little bit of harrassment, followed by a teamfight, and the winner of the teamfight goes for an objective- the gold chest, a tower, or some of the stat-boosting pickups. And that repeats until one team knocks down all 4 enemy towers and wins. It's a constant teamfight with no minion farming and no down-time.. kind of like a 3v3 duel of sorts, very fast paced and a lot of fun.
Decent hero lineup, as far as I know they stopped updating which would be a problem for other F2P games but not such a big deal here. Games are fairly short, with a complete steamroll lasting 4-5 minutes and a long, drawn-out match lasting 10-15 minutes and no more than 20, which means if you get a bad team you will be able to get into a new match pretty quickly.
The item shop is very streamlined. You buy items like you would in a RPG, with 1 slot for boots, chest, helmet, weapon, etc. for a total of 6. Basically 3 tiers of items where every item costs the same and all tier 3 items have a unique passive of some description which can be huge game-changers. Since you can't sell items, buying items in and of itself can be a bit of a skill. For example, you might want to hold off buying *the* lifesteal item until all the enemies buy their weapon, but didn't buy the heal-reducing weapon. Alernatively, if the enemies don't buy have anything that you need to counter, you can try to pick up something like the stun hammer which can give you a huge early advantage. There is even a bit of flexibility in item builds, different heroes can be played different ways, for example the standard archer guy Artharion is usually played as a burst mage but I find him to be far more effective as a ranged carry.
I could discuss every mechanic which is different (stat types, pickups, towers, river, gold chest, etc.) but just suffice to say that it's fairly innovative and unique, and also easy for new players to get into.
So yeah, in conclusion, it's streamlined, but with a lot of hidden depth, and teamwork is EXTREMELY important just like it is in any MOBA game, and of course you can still get fed and dominate the enemy team like in any MOBA game. It obviously runs at a smooth framerate even on your grandmother's 8 year old laptop because it's meant for mobile devices, and the graphics are nothing amazing but not too shabby either. A lot of fun, reasonably competetive, and it's free to play, so there is no reason not to give it a try.