Good game. Horrible RTS.
However, there are also many bad things about Extinction that keep it from being one of the best RTS games on a console. The first and most obvious is a lack of any sort of multiplayer. Multiplayer and AI skirmish mode are essentials for ANY RTS game. The unit limit for each class is ridiculously small also. The aliens have the largest with around 30-40. The predators, however, have about sixteen. Sixteen!!! I suppose the limitation is because of the then superior graphics, but it really suppresses the potential fun.