It's not really midi that has improved is it ? It is the availability of better VST's etc. for rendering the generic midi data.

The 'Hendrix' experiment is really to tout the Amplitube plugs more than the midi. It's the rendering that makes it sound 'good' (matter of opinion though).

As a guitar player, I would never use midi for guitar parts. What I need it for is horns, strings, occassional acoustic bass guitar, percussion. If these were available as RealTracks, by all means I would use them instead of rendered midi parts (except where I needed a signature line, lick...but NEVER midi guitar in my case)

On a side note, I find it amusing that this topic is so polarizing ! Almost as much fun as political or religious doctrinal threads elsewere.