At this point, the only thing it is truly missing is documentation, which I might end up doing myself just to save everyone the hassle.
Actually, I've been writing a Padfoote-style guide to Mekanism. Expect it to be released pretty soon here.And it would be great if you did some good Mek documentation. I have read a few of your pieces from your site and you write in an easy to understand way. I usually brute force Mek when I have a couple 16K drives full of resources but I would like to start it early game one day without relying on TE.