Probably not low-level depression. Probably just reaction to the way your TOR game ended. I know I have reactions like that – “fuck this game and fuck these guys. If no one cares enough to play, just fuck it”.

I personally find my level of game burnout directly reflects how “complete” a system is – how much setting and lists of equipment and story comes along with it. I have this need to like consume it all and make it all matter in play – and if play falters or doesn’t match this material I spent all this time consuming, it irks me. In games where that isn’t present and I can just wing it, I feel much more satisfied.

Digression, but this is actually why I love the Planescape setting. It has source material to consume, but it’s such a free-form world that you can easily maintain cohesion with the source material because those people are angels and the bar is a pocket dimension, etc.