Yes, I do recommend it.
I'm one of the few people who enjoyed the story, but I felt it was stretched out too long with too many "Filler" missions.
I think Super Bunnyhop summed it up when he said "It feels like a very good 12 hour game stretched out to 60 hours."
Which is a shame, maybe Kojima got a bit too indulgent but that's an issue I have with his game.
Gameplay wise, it's one of the very few Open World games to get the nature of gameplay right.
It's really a sandbox stealth action game more than anything.
So yes, I do agree, it's a must have.
There's enough there for people who aren't fans of the series to enjoy, and those who are fans pretty much get rewarded for it.
Out of the two games I bought on launch (and pre-ordered, mostly for their special editions), this was the better of the two (the other being Fallout 4, what a joyous £100 that could have been better spent on food).