Heroes of Newerth is a cross platform MOBA that is free to play.
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Pros
Pro Versatile and unique heroes
Heroes of Newerth has very versatile and unique heroes.
Pro Balanced
Better balanced than a lot of other MOBAs with a ton of small quality-of-life improvements.
Pro Fluid gameplay
Gameplay is polished and feels much smoother/more responsive than many other MOBAs.
Pro Persistence is rewarded
Though the learning curve is steep, with persistence the player will be rewarded with knowledge of a highly technical game that is very fun to play.
Pro 3 different maps
There are two 5 on 5 maps as well as a smaller 3 on 3 map to play on.
Cons
Con Low population
Considerably lower amount of users since DOTA2's release.
Con Steep learning curve
Like most MOBAs Heroes of Newerth has a steep learning curve.
Con Toxic Community
If you pick the wrong ability (even by mistake) everyone calls you a retard and some even rage-quit.
Con Very little original gameplay
Most of the gameplay is copied from similar MOBA games.