RAWR!!
Hey, I'll be sorry to see you go, man. You've been a fellow veteran weathering the storms around here, and it's never fun to part ways but I respect your decision. I can't really disagree with much of anything in your post.
My solution? Stop caring so much. Get back to it just being a game, and quit worrying about nerfs and re-nerfs and counter-nerfs and LUs and combat updates and the like. My litmus test is: "Would I still enjoy gameplay if I wasn't reading Test notes and griping on the forums?" If the answer remains "Yes" (and it has), I keep playing. If I take the gameplay out of the context of all this extra information, and just think of EQ2 as the game I play when I log in, then yes, it's still a good time. I have good friends playing and some characters I really like and I enjoy my time in-game. It's all the extra knowledge that clutters it up, for me - knowing how changes are being tested (or not), dreading LUs, hearing about upcoming nerfs in Test notes... it's an exercise in futility. So I try to isolate actually playing the game from reading and talking about the game, if I get to the point where I'm entirely too frustrated about an activity that I do in my free time for fun.
I'm still enjoying playing a ranger, but I will admit that some of the flavor is gone. I don't feel terribly unique or useful anymore; it's hard to point at our class and find much that we do that someone else can't do better. But I'm still really attached to my character anyway.