Rowan, you still haven't really and truly said why or what prompted the decision to change the mobile site. In an earlier post you said it was to update, modernise and make it look slicker. If that's really the case, then it's an abject failure. The new site does not look more modern, in fact it looks messy and cluttered. The old site looked cleaner, clearer and more professional.
The functionality issues with the new site are terrible, you are making extra work for your users - why? Why are users having to scrabble around customising and bookmarking in order to get the site to work at a fraction of the functionality the old site did? The old site had one press for most of the things people access, the new site doesn't. So, the new site is not easier or quicker, so what's the point?
Distinguishing between threads in active or on any of the topics is not easy, they all merge into one, it's too crowded with the stupid circles with numbers in them.
Reading threads, again, it is awful, the lack of differentiation between posters, posts, the OP not being at the top of each page, etc., means it all merges into one homogeneous mass. Normally I spend many a late night hour whiling away the insomnia by reading MN, last night after 20 minutes I was starting to get a headache, and was losing interest, it was too much like hard work so I switched it off. I will use the desktop site on my old creaky laptop but doubt I will bother with the mobile site much anymore.
I agree there were some minor design and functionality issues that could have been improved on the old mobile site, but you have thrown the baby out with the bathwater with the new design. Most of the people complaining about the new site seem to have the latest modern phones, tablets and browsers and yet they all say the old site worked better on them so who, or what devices were these changes actually done for?