You are falsely smearing Bitcoin Unlimited. The statement you where referring to was talking about the formatting and lazy blocking. Pretty standard for a code review. The lead developer of Bitcoin Unlimited even responded to Gavin in the same thread explaining the reasoning behind this formatting, this had nothing to with there being a faulty executable.
Whatever helps you sleep at night.
XT is a temporary solution, at best. Everyone understands that. Segregated witness is a better solution in the short run, and in the long run we'll have something else (lightning network?)
So XT does not make much sense, don't think they'll be able to pull it through
A lot of things need to be improved upon before we can go with much bigger blocks (e.g. the new library in 0.12 will speed up things a lot). However I do not agree with the Core developers with keeping the 1 MB limit ATM. A bump to 2 MB is definitely something that is desired.