The huge hit to Vitality is a major downside to Glass Cannon that I feel does compensate for the AP boost it gives.
Not even close. A character with 5 Speed and Glass Cannon has as much recovery AP as a character with 17 Speed. 7 Speed + GC is roughly equivalent to 21 Speed. Those are stupidly high numbers, and all GC asks in return is that you throw some points in Constitution instead. Considering the massive savings in Speed, that's no problem. If you take your previous Speed investment, toss it in Constitution instead, and take GC, you will have a stronger character every single time.
Also, Leadership provides crazy bonuses to Initiative, which greatly offsets any need to pump it further with stats. This is actually something which should be looked into, because Leadership makes other Initiative boosts mostly meaningless.
GC is overpowered. And not a little, it's more powerful than any other talent by a country mile. It is game-warping.
When it comes to Lone Wolf, I feel your appraisal is fairly accurate.
