My vote for 88-note roll recordings would be without expression.
I have bought every CD I could find of piano rolls of every kind.
I have some that had some highly artistic pianolist pedaling with
full expression and others with no expression.  I find several things
that bother me a great deal on all these whenever they occur.  Here
are the top ten most annoying things in listening to a recording of
a piano roll.

#10. Damper wires zinging against the string on the grand piano.

#9. Hammers that are so flat that the sound of the piano is also flat.
This bothers me more than just hard hammers of the correct shape.

#8. Loud electric motor -- "Is someone vacuuming the carpet nearby?"
Or outside noise: trucks, voices, squeaking pedals.

#7. Missing notes.

#6. Notes on a reproducing piano that drop out on soft passages,
or expression systems not doing things like they should.

#5. A full keyboard run that starts out loud goes soft in the middle
and ends up loud.  This lets me know the valves have too much travel
and need rebuild.

#4. A piano with a flat soundboard.  This is the sound of "banging
on sewer pipe" that some pianos have on the lower part of the treble
bridge.  This means the soundboard needs to be recrowned.

#3. Additional upright bass and drums playing along.

#2. The piano has not been tuned in decades and has a few 'zingers'
on certain notes.

And the number one most annoying thing I dislike hearing on recordings
of piano rolls (drum roll, please):

#1. Some "real artist" pedalling the roll with expression like I would
never do it.  Sometimes it is just all wrong -- soft when it should be
loud or loud when it should be soft.  If it were recorded with no
expression then I can imagine where I would put expression, but if
it has expression all I can think about is how wrong this expression
really is.

D.L. Bullock    St. Louis
www.thepianoworld.com