I quite like it - I'm not good with guitars and drums, but I sort of understand what papinate says about the orchestra - but the fault is NOT MIDI - MIDI always gets the blame for everything when that's like saying it's English that is at fault for a dull novel.
The things here I notice are lack of individual note velocities - very obvious in the pianio near the end - every note is identical and it seems quantised compared to a real player, and it's rather an unconvincing sound? For me - the strings are a sort of synth string wash. No evidence at all of articulation, bowing or ensemble - sort of play a chord, record it, done. There are loads of excellent, and some even free, strings nowadays. Listen to a Beatles recording with strings. You can have a guess as to how many violins there were, or how many cellos - and hear what they are playing and follow the lines. Yours are just a string patch playing block chords. Real strings might have first and second violins playing close together pitch wise, then the violas below them - which sound different. Then the cellos lower down still - three different tones. This is the giveaway for me. It's perectly fine as a 'sound' - but not real. Nothing to do with MIDI. Everything to do with what library you have and how you use it.
Your voice has decent style to it, and I certainly might tweak the occasional pitch - but it's really pretty good, I thought.
