What are some alternatives?
When comparing Dragons and Titans and Rome: Total War Barbarian Invasion, you can also consider the following products
Vainglory - Multiplayer Online Battle Arena (MOBA) made for mobile
Dota - Dota is an amazing, Massively Multiplayer Online Battle Arena (MOBA), Role-playing Combat and Defense video game developed by Valve Corporation.
League of Legends - League of Legends is an Entertaining, Action-Adventure, MOBA (Multiplayer Online Battle Arena), Online and Multiplayer video game developed and published by Riot Games.
Shards of War - Shards of War is one of the best addictive, Action-Adventure, Sci-fi, MOBA (Multiplayer Online Battle Arena), and Free-to-play video game created and published by BigPoint.
Sins of a Dark Age - Sins of a Dark Age is a Free-to-play, Action, Real-time Strategy, MOBA (Multiple Online Battle Arena), Fantasy and MMO video game developed and published by Ironclad Games.
Chaos Heroes Online - Chaos Heroes Online is a Freemium, Action-Adventure, MOBA (Multiplayer Online Battle Arena), Strategy, Team-based and Fantasy video game created by Neoact and published by Aeria Games.