Per your final comment about your depression with still buying guitar games, allow me to say "HA! Welcome to my world!" and the world of all the BEMANI fans out there who have suddenly realized they might just be getting sick of euro, trance, and J-pop after the eightieth installment of Dance Dance Revolution, or beatmania IIDX and pop'n music for the true snobs among us.
Of course, I had to commit myself to writing FAQs for all these games, which sadly didn't stretch my technical writing ability, and really amount to little more than an easy-to-hand reference guide for who's what in the songs and basically saying "look out for this", so my depression truly runs deep.