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See it if you love Shakespeare and are interested in seeing connections between plays. It's fascinating, and clearly is the result of tons of work.
Don't see it if you can't do 4+ hours of theatre. A long haul, but worth it if you are into an immersive Shakespeare marathon with creative staging/seating.
See it if You like Shakespeare, especially if you like the histories. It's gorgeous, surprising, and Tennant brings a fresh perspective to Richard.
Don't see it if If you don't like Shakespeare. R2 can stand alone, but I think of the rest of the Henriad as a unit. This may be an unforseen commitment.
See it if you are British or a serious anglophile, and if you do not mind hearing contemporary speech in verse.
Don't see it if you know nothing of the UK, its political structure, and its royal family.
See it if You are familiar with the rest of the Henriad. There are definitely a few references which would be confusing without context.
Don't see it if You don't like Shakespeare. The Bard would be proud of the RSC's Cycle of Kings, I think.
See it if you LOVE Shakespeare, if you like TFANA, and because Trevor Nunn is directing. The overall design is quite beautiful.
Don't see it if you don't like Shakespeare, TFANA, Trevor Nunn, song and dance, comedic structure, fictionalized Greek history, or actors in multiple parts.