for the author of the article, scenery/natural setting appears to be a really important criterion. if other criteria are more important for you - location/convenience, size, sound, sight lines, ability to bring a picnic - then you obviously won't agree with the article.
i wouldn't include the hollywood bowl in this list. it is indeed a beautiful venue but the arrangement of seats is sub-optimal - they're too spread out. for a venue of less than 18,000 seats, it covers a lot of land. you need to be seated in the front half of the bowl to see anything.
an outdoor venue that i really liked back in the day was Molson Park, north of Toronto. it was a standing-only GA venue built on a huge & perfect sloping bowl. i caught lollapalooza there in '93 and '94 and it was the perfect venue for it. you could make your way down to the pit for the bands you wanted to be close to, and have a perfect view on the slope/hill when you weren't front and center. i'll admit that i'm remembering the venue through nostalgia-tinted, rose-colored glasses. i believe the site is now strip malls and business parks.