Dragonite: only the Dragon Dance versions are worth it (the mixed wallbreaker ones fail so hard against any one of metagross/bulky water/swampert), and even then its only real advantage over Salamence is access to Thunderbolt to damage bulky waters on the switch. The extra bulk is misleading because it's only specially bulkier (thanks to lack of Intimidate) and that's only relevant against Psychic/Thunderbolt, which are the only moves in general that fall between "it's gonna KO me" and "it's not doing much anyway lol".
Heracross: you should mention how it even destroys Skarmory with Focus Punch. Nothing would be safe from Heracross if 1. Dugtrio didn't exist and 2. it had many switch-ins.
Umbreon: surprisingly bad at what it does in my experience.