The biggest problem is their hardware: they have a Mycroft v1, (to me personally) a prototype alike piece of hardware. There have been successful campaigns for a v2 release, with new hardware and an improved design.
However, they fail to work with reliable partners and there's still no working device which resembles the final production level. I have been a backer of the indigogo campaign but it's frustrating they postpone their Mycroft v2 every time again. I really hope the can deliver the device at some point, but they keep rewriting software and if they ship, the hardware is pretty outdated probably.