Honestly? Without any spoilers there's some really surprising moments, some cool moments, some disapointing ones, but all in all it's a story that feels mostly satisfying if you're willing to give it a few free passes.
I'm glad it's brought to a close and it was done in a mostly satisfying manner, there's a LOT of plot holes and off points.
There's no real "storyline spoilers" in the following text, but some general things you might not want to read if you don't want your first playthrough to be "tainted" and to go in with no expectations.
By far my biggest gripe, and it gives very little away that hasn't already been a big issue with sc2 storyline so far.
Also last word of warning and this might be specific to me. I played it almost all in one sitting before a 13 hour shift and I work in a hosptail - for me the voice filter all protoss zerg and "others" with alien voices are all heavily reliant on overstressing the lower registers of words.
I went into work the next day and between the hum of background conversation, the beeping of medical equipment, fridges, freezers, toasters, two people talking in quieter tones in echoey corriders., and me being a bit sensitive to lower registers etc, The whole fking hospital sounded like a protoss mothership.