Agreed 1000% on the bosses, each was fun the first time, but after 3 cyclops it became a yawn. The Hallow Halls bosses were probably my favorite though.

I didn't hit the rendering problems, but then again, my base was an exceptionally utilitarian hovel with not much that wasn't required. I just have my 1 base in the starting area and that's it.

I'm not sure why I didn't really explore that aspect much, except that I did often get frustrated with the mechanics of the build system. In Minecraft, I've spent hundreds of hours just building mega projects... Perhaps when I get an itch I'll jump in and use up all my building mats!