The plot is still shit
That said, the plot is still nothing more than filler, plain and simple. Despite playing through each mission, I couldn't tell you what was going on beyond the immediate objectives of "investigate this crash site;" "locate this person;" "kill these Russians."
The Tom Clancy brand used to guarantee an interesting plot, but Ghost Recon: Future Soldier proved once and for all that that's no longer the case. And the "Raven Strike" missions only serve to emphasize that. If you're going to play them, glory in the greatness of the game's mechanics and the stellar level design evident within, but feel free to zone out during the bare-bones narrative.