This is a bug in the CC 2017 release. The Adobe After Effects team is aware of it and have said they are working on a fix.
Is there somewhere I can turn this off, or put it back to the 2015 settings?
as Szalam pointed out - this is a known bug in the current version and will be fixed pretty soon.
the workarounds are quite easy:
1. before you send your comp to AME, change the resolution pop up to FULL
2. use the much better feature "Queue in AME" option that was introduced in the last version and is right there in the render queue.
here's a comparison between the "ADD to AME Queue / drag and drop" and "Queue in AME" to see why this should be your new best friend - watch from 02:54
Thanks for the helpful update!
As for the workarounds; workaround 1 is the one I mentioned, and while that is ok if you want to render one or two files, it is quite a nuisance when you have 32 different titles, duplicated comps from an original comp that happened to be set at 25% preview, for example.
The second one, however, does help a lot, so thanks for pointing that out. Still a bit of an extra click, but a lot better.
As for the video, basically what dragging and dropping from the project bin to AME was basically the same thing as "Add to AME", but for multiple comps. As far as I can tell.
Looking forward to the bug fix either way