YouGamers has a detailed review of the Tribes of the East expansion, written by someone who seems familiar with the series. The author describes the new features introduced by the game, lists some of the surprises that can be found in the campaign scenarios, talks about the Orcs and their blood rage... and blames the game for being resource-hungry:

"One of these is the fact that even on higher end dual core systems with 2 GB RAM and a top end graphics card, the performance can get painfully bad after several hours of gaming. Especially lengthy battles seem to have a huge impact on performance, so it seems to be a question of bad memory management (throwing more RAM into your setup may help for a while, but ultimately it will only delay the slowdowns and the time to when you'll have to quit and restart the game)."

Tribes of the East gets a 75% grade, with praises for the gameplay ("one of the best versions in terms of gameplay mechanics and the amount of tactics the players can use") and the art design, and complaints for the cutscenes and game engine.