How much time have you got for just one game-
This will have you hook line and sinker after a few hours. There is always something to do, even on a daily basis it is very difficult to complete all your objectives.
The biggest pain of this game is the patching and loading which can vary depending on where you are located.
Also the servers are region based so even if your friends are playing in the USA and you are in the UK = you will not be playing together because you are different regions.
But that's a small price to pay for something that makes game play demanding most of the time. You wont be spending too much time discussing strategy when there's a bunch of diseased humans and aliens pursuing you.
AI is unpredictable – events and encounters are not sequential or patterned. Its you or them in the exercise of survival. Note the AI in Defiance is tweaked every week to make situations more difficult or demanding in some way. This also affects Arkfall and alien behavior.
Rewards are varied and consistent with how you play.
You can't have a perfect character for all situations but the HUD allows you to save a number of variants for quick swap in the field of play.
I rate this game higher than average because it delivers consistency and you can just play this without anything else for some months without getting bored. It could make you game addict.