When using the Nautilus text-view on a plain-text
file, I'm notice two issues:

1) There are no margins, and thus the text rubs
right up against the edge of the text-view
widget's side.  This can make text at the edge
hard to read.  There should be at *least* a 2-3
pixel margin. (I notice this problem with most
apps that use a text view - nobody uses margins...)

2) The font is proportional.  A lot of plain-text
files make use of the monospace facility for
things like underling and such (basic ASCII art,
simply), and in proportional fonts they look all
garbles.

I'll attach a screenshot showing both the lack of
margins and the way the proportional font screws
up alignment of items.