Long, plodding but exceptionally well made with an explosively "Tarantino" ending, OUATIH is difficult to recommend but enjoyable to watch. Outside of it's Hollywood history lessons and 60's and 70's nostalgia, viewers may be disappointed by the pictures surprising lack of signature dialogue or overt violence that usually comes with Quentins name when attached to a motion picture. But if you put stock in overal production value, clever links/theming through the characters on screen, and sweeping statements about the state of Hollywood both now and then, OUATIH might just be worth the cost of admission.
Personally, I'm still very much a fan of Tarantino's heyday with Pulp Fiction, Kill Bill, Django and Inglorious being up on my favourites. These movies seem to be much more immediately entertaining, while still offering Quentins usual attentitive level of detail and depth. OUATIH offers the depth, but never really pulls out all of the Tarantino hallmarks you've come to expect, so I'm giving it a 7/10.

Edit: I've mused over this movie for 24 hours and I think it's going up a point. Some of it's dialogue is pretty memorable and the themes on show upon reflexion are much deeper and open to interpretation than I initially thought. Definitely going to give this one another spin when it hits streaming services/digital download.

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Interesting points of note (And thus, spoilers):

All of Cliff Booth's solo scenes are shot like an old western. The long walk to Georges cabin, the watching bystanders, very "old western" inspired filming. In the final scene, it is shown that Cliff is stabbed in the hip. Rick Dalton says, while reading his book on set, that Easy Breezy was the coolest guy, until he hurt his hip. This is an interesting juxtaposition between Cliff and Ricks characters. Rick is desperately trying to be the cowboy that Cliff is living as on the daily.

Rick mentions at the start of the movie, when Roman Polanski pulls up next to him with Sharon in the car, that he could be one pool party away from being in a Polanski movie. At the end of the movie, after roasting the Manson killer in his pool, he is invited into the Polanski residence, which would assumedly lead to him starring in one of his movies. Cool bit of foreshadowing.