Agree that it's not either/or, I just haven't yet found MIDI based tracks (either as a whole MIDI production or mixed with Realtracks or audio) that my ears don't soon tell me are not "real". I've listened to some user showcase things, but if anyone has particularly good examples I should focus on, I'm "all ears".
I'm mainly dealing with a fairly narrow genre - small ensemble jazz, and largely needing Biab to provide guitar/bass tracks that I can add my own keyboards and vocals to. As I mentioned, I don't find the Realtracks horn parts very usable (too "generic" sounding, which I guess is the goal

) ,and don't really have a need for them anyway. And I am adding my own piano/electric piano and sometimes vibes/marimba parts, which are using MIDI sound sources. My cross section is admittedly narrow - and a place where I find the Realtracks jazz guitar and bass parts exactly what I needed to complete some projects on my own. I do think the acoustic guitar is especially difficult to make believable in the MIDI world. If I do find things I can't accomplish with the Realtracks, Ample Sound guitars are the place I'll turn. Their classical guitar modeling/sampling and tools are pretty amazing.
The stuff I'm doing so far are cover tunes, so I can't post them here. But when I get a chance I'll put something original together just for an example.