No grounds for a boot in my opinion. As for questioning why you don't have the Defender class up and running by now is none of my business. However, I will say this, a skilled Defender titan can own in PVP and is the strongest subclass a titan can utilise in most raid situations. So, my advice would be to focus on getting the Defender subclass completed and go practice using it. I rarely ever used Defender, but some situations really did call for it, so I was kinda forced to start using it. I was actually surprised at how much I enjoyed it, especially when doing the Defender subclass emblem quest in crucible for it.