TLDR summary:
Glasshouse is useless. Instead of its current buff duration increase, it needs to allow both Weapons and Blessing of Light to be granted from a Defender's super.
Glad you agree! And thank you, with the economy the way it is, I could use a great job.
The thing is that the Glasshouse is intended in theory to strengthen the Defender's support capabilities and increase the impact of the ward.
However, it doesn't perform either of these roles well in practice. An increased timer aids WoL little, and doesn't do anything to increase the effectiveness of BoL at all.
As someone who mains a Defender, and enjoys playing a support role, I find the idea of an exotic which boosts support capabilities an attractive one. But the Defender is lacking in quality exotic armor options.
No Backup Plans has some uses, but none of the exotics can stand up to the Helm of Saint-14. None of the other exotics can match the Saint's power and flexibility, they just aren't well enough designed.