Arnold doesn't get enough credit for his posing. Granted his routine wasn't as well choreographed or as fluid as Corney's but his poses were all perfect. He always showed only what made him look impressive: his strengths.
Today, BB's will do all poses with no thought about whether it makes them look good or not. If a guy has awesome pecs/shoulders and a crappy back, he'll still show his back as much as his pecs/shoulders during the free posing routine. makes no sense.